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Published on August 25, 2025
29 min read

The Ultimate Guide to Retirement Planning Investments in the USA

The Ultimate Guide to Retirement Planning Investments in the USA

Let's face it - thinking about retirement can be pretty daunting if you want to be honest. One moment you are prioritizing your career, paying off student loans, starting to think about buying your first home, and the next someone mentions retirement planning, which may stop you dead in your tracks. If you are like most Americans, the idea of determining how to generate enough savings for a comfortable 20, 30 or even 40 years after you stop receiving a paycheck seems crippling.

But here's the thing: retirement planning doesn't have to be complicated, and you don't need to be a Wall Street expert to build a solid financial foundation for your future. What you do need is a clear understanding of your options, a realistic plan, and the discipline to stick with it over time. That's exactly what we'll cover in this comprehensive guide.

Why Traditional Retirement Thinking Is Broken

For decades, Americans relied on what financial experts called the "three-legged stool" of retirement: Social Security, employer pensions, and personal savings. That model functioned well enough when most people toiled away for a single company for their entire working life, retired at 65, and then proceeded to live 10-15 more years.

Today, life's path looks dramatically different. The average American will change jobs multiple times during their lifetime. Traditional pensions are almost nonexistent in the nearly comprehensive replacement of pensions with 401(k) plans that transfer the investment risk from employer to employee. And, people are living longer—and significantly longer at that.

A 65-year-old today has a good chance of living into their 90s, meaning they need their money to last 25-30 years or more. Social Security, while still an important safety net, was never designed to be anyone's sole source of retirement income. The program replaces roughly 40% of pre-retirement income for average earners, but most financial advisors suggest you'll need 70-80% of your pre-retirement income to maintain your lifestyle.

This shift means the responsibility for retirement security has moved squarely onto your shoulders. That might sound scary, but it also means you have more control over your financial future than previous generations did.

Starting With the Foundation: Understanding Your Timeline

Before diving into specific investment strategies, you need to understand where you stand today and where you want to be tomorrow. Your retirement planning approach will vary dramatically depending on whether you're 25 or 55, whether you're starting from zero or already have some savings, and what kind of lifestyle you envision for your retirement years.

The Power of Starting Early

If you're in your twenties or early thirties, you have the most powerful wealth-building tool on your side: time. Thanks to compound interest, someone who starts investing $200 per month at age 25 will accumulate significantly more wealth by retirement than someone who starts investing $400 per month at age 35, even though the second person contributes more money overall.

This is a real life example of this principle in action. Let's say Sarah starts investing $300 each month in a diversified portfolio at age 25 and earns an average return of 7% per year. At age of 65, she would have put in a total of $144,000 and a total of over $740,000. Now, imagine that her friend Mike waits until age 35 to invest the same $300 a month in the same diversified portfolio and reaches the same long term average return of 7%. By age 65, Mike would have contributed $108,000 and accumulated just about $370,000, almost half of Sarah's total accumulated value, while only starting 10 years after Sarah!

Catch-Up Strategies for Late Starters

If you're starting later in life, don't despair. While you can't buy back time, you can make up for lost ground by saving more aggressively and taking advantage of catch-up contribution limits. Americans aged 50 and older can contribute an additional $7,500 to their 401(k) plans and an extra $1,000 to IRAs beyond the standard limits.

More importantly, your peak earning years are typically in your forties and fifties. This is when many people will experience their greatest salary increases, fully pay down their mortgages, and have fewer dependent expenses, as the children become financial independent. All of these elements can open up large amounts of cash for retirement investing and savings, if leveraged in a strategic manner.

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Frying Up the Retirement Account Landscape

In the U.S., there are several different tax-advantaged retirement savings vehicles, with different set of rules, benefits, and exemptions. Deciphering these retirement account options is important because the best combination can save you literally thousands of dollars in taxes and maximize your retirement net worth.

401(k) Plans - The Employer Heavy Lifter

For most Americans, their employer's 401(k) plan is the first point of contact with retirement planning and with good reason. These accounts allow an immediate tax deductible contribution, allows tax-deferred growth, and commonly contains employer matching contributions, which is free money.

Traditional 401(k) contributions reduce your current taxable income dollar-for-dollar. If you earn $70,000 and contribute $10,000 to your 401(k), you'll only pay taxes on $60,000 of income. That money grows tax-deferred until retirement, when you'll pay ordinary income tax rates on withdrawals.

Roth 401(k) options work differently. You contribute after-tax dollars, but your money grows tax-free, and qualified withdrawals in retirement are completely tax-free. This can be particularly advantageous to younger employees or workers who anticipate being in higher income tax brackets later in their careers.

The key to optimizing your 401(k) plan is to fully understand the matching formula of your employer. Some employers provide dollar-for-dollar match on contributions made up to a percentage of one's annual earnings, while some match more or less than a dollar-for-dollar basis, such as only 50 cents on each dollar contributed. Regardless of your employer's employer's contribution formula, you should be contributing your fair share up to the max amount, minimum, required to receive the employer cheese— free and clear! it is the absolute best deal you will ever find... an immediate 100% or 50% return on your money!

Individual Retirement Accounts: Flexibility and Control

IRAs tend to provide greater investment choice and flexibility than most 401(k) plans. The majority of 401(k) plans allow participants to invest in a menu relatively small number of mutual funds selected by their employer. You may still select and purchase mutual funds inside an IRA, but you can also purchase individual stocks, bonds, ETFs, or even invest in alternative investments like real estate investment trusts as well.

Traditional IRAs are similar to traditional 401(k)s, where you get a tax deduction now, and pay taxes on withdrawals. There are, however, income limits that apply for deductible contributions if you also participate in a company's retirement plan.

Many investors like Roth IRAs because they permit tax-free growth and tax-free withdrawals in retirement, as well as do not require you to take minimum distributions throughout your life! All of these features make them excellent vehicles for wealth transfer to heirs.

Roth IRAs have higher income limits than traditional deductible IRAs, so high earners might want to consider a "backdoor Roth," which allows them to make non-deductible contributions to a traditional IRA and then convert such contributions to a Roth IRA.

Health Savings Accounts: The Triple Tax Advantage

Health Savings Accounts are potentially the best retirement plans available, but they are sometimes less recognized. HSAs have the rare triple tax benefit of being deductible, having tax-free growth, and being non-taxable when used for qualified medical expenses.

After age 65, you can take the HSA for any purpose without penalties (non-medical usage is tax deductible, making it function like a traditional IRA). Because healthcare costs usually increase significantly in retirement, maximizing your contributions to HSAs can be an extremely advantageous move.

You can have an HSA if you enroll in a high-deductible health plan. The contribution limits are significant, with $4,150 for individuals and $8,300 for families in 2024, plus a $1,000 additional contribution for those age 55 and over.

Investment Strategy: Building Your Portfolio

You've learned about the significant types of accounts available to you; now it's time to develop an investment strategy that provides good growth potential and allows you to manage risk. The goal is to create a diversified portfolio that can tolerate market volatility while providing enough returns to fund your retirement contributions.

Asset Allocation Basics

How you divide your investments between stocks, bonds, and any other assets is referred to as asset allocation, and it is one of the most important decisions you will have to make that will really influence the long-term performance of your portfolio. Studies found that approximately 90% of your portfolio's returns over a period of time is explained by your asset allocation instead of your selection of individual securities or the timing of the market.

The traditional rule of thumb is to take your age and subtract it from 100 to come up with your stock allocation. For example, a thirty-year-old would hold 70% stocks and 30% bonds; a sixt-year-old would hold 40% stocks and 60% bonds. In light of increasing life spans and potential returns of bonds in a low-interest rate environment, many financial advisors have begun suggesting a more aggressive stock allocation. A more appropriate method today may be taking your age minus 110 or 120 to achieve a more aggressive stock allocation throughout your career.

The key is understanding that stocks, despite their volatility, have historically provided the best protection against inflation and the best long-term returns.

Domestic vs. International Diversification

Many American investors suffer from "home country bias," overweighting U.S. investments in their portfolios. While the U.S. stock market represents about 60% of global market capitalization, many portfolios are 80-90% invested in U.S. assets.

International diversification can reduce portfolio volatility and provide exposure to growth opportunities in emerging markets. A balanced approach might allocate 70-80% to U.S. investments and 20-30% to international developed and emerging markets.

The Case for Index Funds

For most investors, low-cost index funds represent the optimal investment approach. Index funds track market indices like the S&P 500, providing broad market exposure at minimal cost. Typically, actively managed mutual funds cost 0.8-1.2% annually, while the fee for an index fund is usually 0.1% or less.

Fee differences compound over time. For example, on a $100,000 investment, the difference between 1% annual fee vs 0.1% annual fee is over $175,000 over 30 years at a 7% annual return. And most actively managed funds don't outperform their benchmark indices over the long-haul. Standard & Poor's regularly publishes data showing that about 80-90% of actively managed funds will underperform their benchmark indices over time periods of 15 years or more.

Target-Date Funds: Autopilot Investing

Target-date funds are actively managed funds designed to shift their asset allocation as you approach retirement to become more conservative. A target-date fund is an entire investment solution in one fund; they arguably fit best for investors that want something to "set it and forget it."

Even though target-date funds aren't perfect—they won't know your risk tolerance or consider any other assets you may hold—they're still infinitely better than the alternatives of leaving all your money in cash or, God forbid, company stock.

Tax Strategy: Maximizing After-Tax Wealth

Tax effective retirement planning means thinking beyond simple asset accumulation, which is very much about maximizing your after-tax wealth, versus your pre-tax account balances.

Traditional vs. Roth: Selecting the Appropriate Account

The choice between traditional or Roth accounts is based on your actual tax rate versus what you expect your tax rate will be in retirement. If you expect to end up in a lower tax bracket in retirement, then the traditional route is the better plan due to deducting contributions at a higher rate now, while paying tax at the lower rate later.

However, many people underestimate their tax rates in retirement. Usually, without mortgage interest deductions, dependent exemptions, and other deductions that disappear at retirement, your effective tax rate may actually turn out to be higher, even when you are receiving a lower income.

Roth accounts provide additional benefits as well, both tax and planning flexibility in retirement. Since Roth withdrawals are not taxable income, none of them are counted in the Social Security taxation, Medicare premiums calculations, or cause you to move into higher tax brackets to name a few.

Tax Location Strategy

Tax location is placing investments in the least tax impacted accounts. For example, bonds and income-generating investments work more tax-efficiently inside tax-deferred accounts (traditional 401(k)s and IRAs), while growth investments are usually more tax-efficient holding them in a taxable account where you can use capital gains talking about their preferential rates.

This is more important, the higher your account balances grow. In the earlier stages of retirement planning, being simple usually is more efficient than being optimized. There is a level of wealth upon which tax location can save you a bunch of money.

Required Minimum Distributions

At age 73 you must take required minimum distributions (RMD) from your traditional 401(k) and IRA accounts. The tax authorities calculate RMD's from your year-end account balance over your life expectancy. The lack of taking required distributions has a 50% penalty if you don't take the amount you are supposed to.

RMDs can push retirees into higher tax brackets and impact Social Security taxation. In order to mitigate future RMD amounts, Roth conversions at ages sixty something prior to RMD requirements can manage this issue.

Social Security Optimization

Most Americans do not know how to optimize Social Security, which is a big part of many retirement income plans. The decisions you make about when and how to claim Social Security can affect your lifetime benefits by tens of thousands of dollars.

Understanding Your Benefits

Your Social Security benefit is based on your highest 35 years of earnings, adjusted for inflation. If you worked fewer than 35 years, zeros are averaged into the calculation, significantly reducing your benefit. This is why continuing to work, even part-time, can be valuable if you have gaps in your work history.

You can obtain your estimated benefits through the SSA website, and this estimate assumes you are going to earn the same salary until your full retirement age and it may over estimate or under estimate where you are currently on your career path.

The Claiming Decision

You can claim Social Security benefits as early as age 62, although doing so will permanently reduce your earned benefits. On the contrary, if you delay claiming past your full retirement age, which for those born after 1943 is 66 to 67, your benefits could increase by 8% for each year of delay up to age 70.

So, if, for example, your benefit at full retirement age is $2000 per month, your benefit at age 62 would be about $1400, but if your waited until age 70 the benefit would be about $2640. Over the course of a 20-year retirement, the difference in total benefits received by claiming at 62 or 70 is greater than $300,000.

The best claiming strategy will depend on your health, your financial situation, and any other sources of retirement income available to you. For example, single, healthy people almost always benefit from delaying benefits, while married couples must consider spousal and survivor benefits and how they affect claiming together.

Spousal Benefits and Strategies

Married couples have access to spousal benefits, and their combined benefits can provide a meaningful addition to their Social Security income. When claiming spousal benefits, a spouse can either claim benefits based on their own work history, or claim up to 50% of their spouse's benefit at full retirement age, whichever is greater.

Survivor benefits allow the surviving spouse to claim the surviving spouse or their own benefit whichever is greater. This is why it often makes sense for the higher earning spouse to delay benefits, the higher benefit will become the survivor benefit for the surviving spouse.

Estate Planning and Retirement

Effective retirement planning is planned beyond your lifetime and designed to reduce friction for passing your assets onto your heirs. Estate Planning assumes great importance as your retirement wealth builds because different account types potentially have very different rules for inheriting assets.

Beneficiary Designations

Retirement accounts pass to beneficiaries via beneficiary designations not testamentary (will or trust), therefore it is important to keep (and encourage your heirs to keep) beneficiary designations up-to-date. If a now divorced spouse is an account beneficiary, your retirement assets go to them even if your will passes your assets to someone else and they may not even be aware of it.

The SECURE Act was passed in 2019 and streamlined many rules about inherited retirement accounts in a way to require non-spouse beneficiaries to withdraw all money from inherited retirement accounts within 10 years instead of outliving their withdrawals. Most families will now find Roth accounts even more valuable for estate planning reasons, and Roth accounts will accumulate tax free for the 10-year period.

Trust Considerations

If the estate is large enough, using trusts can provide additional protection and increased control over how retirement assets are distributed to heirs; however, naming trusts as beneficiaries of a retirement account can lead to accelerated distributions from retirement accounts reducing the control the trust gives you through your own personal planning. This is a more complicated alternative and particularly requires the planning and guidance of qualified professionals.

Healthcare and Long-Term Care Planning

Healthcare costs represent one of the largest and least predictable expenses in retirement. The average healthy 65-year-old couple will spend about $300,000 on healthcare costs throughout retirement, and that doesn't include potential long-term care expenses.

Medicare Planning

Medicare covers many healthcare costs, but it's not comprehensive. Medicare Part A covers hospital costs, Part B covers doctor visits and outpatient care, and Part D covers prescription drugs. Most retirees also need Medicare supplement insurance or Medicare Advantage plans to fill coverage gaps.

It is essential to understand Medicare's enrollment rules because late enrollment may imply permanent premium penalties. In general, you should aim to enroll in Medicare during your initial enrollment period near age 65, unless you have qualifying employer coverage.

Long-Term Care Insurance

Long-term care expenses can deplete your retirement savings quickly. In many areas, the average cost of a private room in a nursing home is more than $100,000 annually, and Medicare covers little if any long-term care costs.

Long-term care insurance can help shield your retirement assets from these expenses, but plans tend to be expensive, and coverage is somewhat limited. Alternative approaches include self-insuring by holding larger cash reserves, or using hybrid life insurance plans that include long-term care riders.

Designing Your Retirement Income Plan

Accumulating retirement assets is one step—the second step is implementing a strategy that will provide you with sustainable retirement income using those assets. In addition to knowing your withdrawal rates and structuring withdrawals to mitigate sequence of returns risk, you'll need to coordinate income sources for retirement.

Knowing the 4% Rule

Historically, the 4% rule states that you can take 4% of your portfolio in the first year of retirement, and thereafter, increase that amount for inflation for the rest of your retirement. To be mathematically precise, the rule comes from a historical backtesting study that quantifies all of the 30-year time periods in capital markets history and shows that the safety-first approach would have worked in each of those periods in the stock and bond markets without any market access.

However, the 4% rule has limitations. It assumes a fixed withdrawal rate regardless of market conditions, and it may be too conservative for some retirees while being too aggressive for others depending on their specific circumstances and market conditions at the time they retire.

Dynamic Withdrawal Strategies

More sophisticated withdrawal strategies adjust spending based on portfolio performance and market conditions. A withdrawal strategy may include withdrawing 4% in good markets and withdrawals may be decreased to 3% when the market is poor. With withdrawing and reducing, a retiree can achieve a higher average withdrawal and reduce the risk of running out of portfolio assets.

The drawback to dynamic withdrawal strategies is the need for flexible retirement spending, which may not be feasible with fixed expense retirees.

Sequence of Returns Risk

In retirement, the priority of the rate of investment returns is particularly relevant. If there are poor returns at the beginning of the retiree's portfolio withdrawal period, it can adversely affect the portfolio's longevity even if there are good returns later.

The way to manage this risk may be to hold larger cash reserves, use a bond ladder to have predictable cash flows, or use a "buckets" strategy to hold the client money based on when they were needed.

Common Retirement Planning Mistakes

Even in good faith, a saver can put their retirement required future financial position in jeopardy by using common mistakes. Knowing the biggest mistakes and taking measures to avoid them can vastly improve your retiree outcomes in retirement.

Better Than Expected Expenses

Most retirees understate their retirement expenses by thinking their expenses will decrease significantly in retirement. While you may have less commuting and clothing expenses, you may have more healthcare expenses, less benefits coverage, more travel expenses, and more for leisure and activities.

Some financial planners will tell you not to be surprised if your expenses actually increase during your early retirement years because you are doing activities and hobbies that you deferred during your peak working years. A more realistic assumption is to think about needing 70-80% of your pre-retirement income as expenses, and adjust based on your situation. If you are typically spending most of your pre-retirement income on travel or expensive hobbies, then you may need to rely on 100% or more of your pre-retirement income.

Forget About Inflation

Inflation decreases the purchasing power over time and is especially significant with long retirements. For example: assuming an average of 2.5% inflation, something that costs $1,000 today will cost approximately $1,640 in 20 years.

A retirement income plan needs to consider inflation by including growth items like stocks and real estate. Bonds will give you safety in your retirement portfolio but they cannot give inflation protection over many years.

Over Concentration in Company Stock

Allianz, Fidelity, New York Life, etc. (401(k), profit-sharing, stock-option plans) many employees retire with a large exposure in company stock and perhaps they just never sold any. In the past, many people have had exposure in company stock by accident. There is nothing wrong with taking pride in investing in your employer, and that's a good strategy based on having a good deal of professional knowledge.

However, investing in individual stocks is only a natural exposure if you own an entire company's stock portfolio. If you are all in on a stock (especially your employer's stock) you should be aware of the principal, investment risk, concentration risk, and are taking on and were responsible for additional risk. In particular, you should know what might happen if your employer fails. You could lose you job and a large amount of your retirement savings at the same time.

Diversification is especially critical when you human capital (your capacity to earn income) and your investment capital is both invested in the same employer.

Emotional Portfolio Buying and selling as a response to psychological events in the market often leads to potential permanent poor investment returns and loss of capital. For example, panic selling within falling markets and buying speculative investments during increasing markets (buy high and sell low) will lower long term potential returns.

Having a written investment plan that if you follow during market conditions is important. It can mean rebalancing your portfolio when expected, or continuing to contribute cash during a down market, or simply not checking your account values every day when the market is volatile.

Working with Financial Professionals

While it's possible to handle retirement planning on your own, many people benefit from working with financial professionals. The key is understanding the different types of advisors, how they're compensated, and what services they provide.

Types of Financial Advisors

Fee-only financial planners charge fees directly to clients and don't receive commissions from investment products. The "client-advisor," as I will refer to them today, are often in alignment with your interests--this alignment of interests leads to more objective advice for most. Fees charged are often significant.

Commission-based advisors are compensated by selling you financial products. This can lead to conflicts of interest. On the other hand, many commission-based advisors provide a valuable service for clients with simple situations who do not want to pay for an on-going advisory fee.

Fee-based advisors use both methods of compensation, charging fees for some of their services and collecting a commission for other services. This model can work well but requires understanding how your advisor is compensated for each recommendation they make.

Robo-Advisors and Technology Solutions

Robo-advisors provide automated investment management at low costs, typically 0.25-0.50% annually. These platforms use algorithms to create diversified portfolios based on your risk tolerance and goals, automatically rebalancing and tax-loss harvesting.

Robo-advisors are not a substitute for the full range of financial planning, but they are solid alternatives for investment management, especially for younger investors or those with uncomplicated situations. A growing number of traditional advisory firms are establishing hybrid models that merge robo-advisor technology with limited meetings with human advisors.

Implementation: Taking Action

While understanding retirement planning concepts is helpful, implementation is what counts.. The best retirement plan is one you'll actually follow, which means starting with manageable steps and building momentum over time.

Getting Started: Your First Steps

If you're just beginning your retirement planning journey, start with these priorities:

First, contribute enough to your employer's 401(k) to capture any matching contributions. This is free money you can't afford to leave on the table.

Second, build an emergency fund covering 3-6 months of expenses. This prevents you from having to withdraw retirement funds during financial emergencies.

Third, increase your retirement contributions gradually. If you can't afford to maximize contributions immediately, start with what you can afford and increase your contributions by 1-2% annually or whenever you receive raises.

Automation and Systems

Successful retirement planning relies heavily on automation. Set up automatic contributions from your paycheck to your 401(k), automatic transfers from your checking account to your IRA, and automatic investing within your retirement accounts.

The goal is making retirement saving invisible and effortless. When contributions happen automatically, you won't be tempted to spend that money elsewhere, and you won't have to rely on willpower to maintain your savings discipline.

Routine Reviews and Revisions

Your retirement planning experience is not a "set it and forget it" proposition. Annual planning reviews are important to monitor progress, make adjustments to contributions, rebalance investments, and adjust plans as circumstances and priorities change.

Major events in your life such as marriage, divorce, career changes or losses, inheritance, health and illness can cause you or your family to make significant adjustments to plans. Routine reviews will keep your retirement planning closely aligned with your retirement strategies, goals and circumstances.

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Going Forward

When you think about retirement planning as one giant problem, it can be a little (or a lot) intimidating. As with most large, multi-faceted goals, when you start to tackle your retirement plans in smaller incremental steps it becomes much less daunting. You don't need to have all the answers figured out on your first day, you just need to start and then improve your process over time.

Starting is the most important thing. Regardless if you are 25 years of age or 55 years, regardless if you are starting with $50 per month or $5000, just start today. Start and allow the miracle of growth by compounding work for you. Every month that you delay starting is a month of future growth you will never get back.

Also, keep in mind that retirement planning is not solely about growing a large sum of money—more importantly, it's about developing the financial framework to allow you to live the life you want in retirement. That might mean travelling the world or down the road, engaging in time intensive hobbies, spending time with family and/or having the comfort of not placing a financial burden on you children.

The strategies and concepts we have discussed in this guide are broad based and cover a lot of ground in the retirement planning spectrum. Your plan, however, will look and feel slightly different based on your unique circumstances, situations, goals, and priorities. It is important that you take the time to learn about your options in order to make informed decisions. Understand your preferences but do not hesitate to seek help from a professional when you feel you need it.

Your future self will appreciate the financial discipline and planning that you are demonstrating today. Your retirement dreams can be a reality if you have the right strategy, execute consistently and have the patience to let time work. So start today, stay consistent, and enjoy the journey, your financially-free retirement is simply waiting for you to take it.