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Retirement

The comprehensive guide to your Amazon 401(k)

By the Progress Wealth Management editors Updated 2026-05-04

Amazon's 401(k) plan is, at first glance, less generous than the headline equity comp suggests. The match formula is modest, vesting is not immediate, and the default investment options are conservative. Look closer and the plan is actually quite powerful — particularly because of the after-tax contribution feature that turns it into one of the larger tax-advantaged accumulation vehicles in tech.

On this page
  1. Plan basics
  2. The employer match
  3. Vesting on the match
  4. After-tax contributions and the mega-backdoor Roth
  5. Investment menu
  6. Pre-tax vs. Roth deferrals
  7. Common mistakes

Plan basics

Amazon's 401(k) is administered through a major recordkeeper and is available to most US full-time employees after a brief eligibility period. Employees can elect to defer a percentage of pay on a pre-tax, Roth, or after-tax basis, subject to the IRS limits applicable that year. Loans and hardship withdrawals are permitted under defined conditions; we generally recommend treating the 401(k) balance as untouchable until retirement and dealing with shorter-horizon cash needs through other accounts.

The employer match

Amazon matches a portion of employee 401(k) contributions on a per-paycheck basis. The match formula is, in headline terms, less generous than at some competing employers — but the match is real money and remains the highest-confidence return any employee can earn. Verify the current match formula in the official benefits portal; it has been adjusted in past plan years.

How the per-paycheck mechanic bites

The match is calculated on the contribution made that pay period, not retroactively. If you front-load deferrals — say, electing 30% of pay early in the year and hitting the IRS deferral limit by August — Amazon will not contribute match dollars in September through December because you are no longer making employee deferrals.

Some employer plans provide a year-end true-up that retroactively credits the missed match dollars; check whether Amazon's plan currently includes a true-up, and if so, how it is calculated. The simpler and safer approach is to spread deferrals evenly across all 26 paychecks so that some contribution is made every period, capturing the per-paycheck match every time.

Vesting on the match

Unlike at some employers where the match vests immediately, Amazon's match has historically had a vesting schedule tied to years of service. This means that if you leave Amazon before the vesting cliff or full graded-vesting date, some or all of the employer match dollars are forfeited back to the plan.

For employees planning a multi-year tenure, this is a non-issue. For employees considering a shorter stay, it can be a meaningful number. Calculate the dollar value of unvested match before any major decision and either factor it into the offer evaluation if you're being recruited away, or negotiate a sign-on at the new employer that explicitly buys out the lost vesting.

After-tax contributions and the mega-backdoor Roth

This is where Amazon's plan goes from average to genuinely valuable. The IRS sets two limits on 401(k) plans:

  • An employee elective deferral limit on pre-tax and Roth contributions, which is the number most people are familiar with.
  • A much higher total annual addition limit on the sum of employee deferrals + employer contributions + employee after-tax contributions.

The gap between those two limits — typically tens of thousands of dollars per year — can be filled with employee after-tax contributions, which Amazon's plan permits. After-tax contributions are made with money you've already paid income tax on, so the principal is not taxed again, but the earnings are taxable when withdrawn.

Converting after-tax to Roth

The strategic move, called a mega-backdoor Roth, is to either:

  1. Use the plan's in-plan Roth conversion feature to convert after-tax balances to Roth status as they're contributed (or shortly after), or
  2. Roll after-tax balances out to a Roth IRA via in-service distribution if the plan allows it.

Either path produces the same end result: the after-tax dollars become Roth dollars, where they grow tax-free and can be withdrawn tax-free in retirement. The earlier in the year the conversion happens, the less time after-tax earnings have to accumulate (and become taxable on conversion).

For senior Amazon employees, the after-tax space is often the single largest tax-advantaged accumulation opportunity available. Setting it up requires:

  1. Calling the recordkeeper and electing an after-tax contribution percentage.
  2. Enabling the automatic in-plan Roth conversion feature, if available, or scheduling regular in-service withdrawals.
  3. Verifying once a year that the elections are still in place and that the contribution amounts are working with cash flow.

Investment menu

The default investment for new participants is typically an age-appropriate target-date fund. Target-date funds are a defensible default — diversified, low-cost, and rebalanced automatically — and most participants would do worse by trying to build a custom portfolio.

For investors who do want more control, the menu includes broad index funds (US total market, US large cap, international, bond) at institutional expense ratios that are difficult to beat. A simple two- or three-fund portfolio at the lowest available expense ratios is a reasonable construction. The brokerage window, if available, opens up a wider range of mutual funds and ETFs but typically charges higher fees and is not necessary for a sound long-term portfolio.

Pre-tax vs. Roth deferrals

The decision between pre-tax and Roth deferrals depends on the difference between your current marginal tax rate and your expected marginal rate in retirement. The crude rule:

  • Pre-tax wins when your current rate is higher than your retirement rate.
  • Roth wins when your current rate is lower than your retirement rate.

For a senior Amazon engineer in the 32%, 35%, or 37% federal bracket plus a high-tax state, current rates are usually higher than what most people expect to face in retirement, which favors pre-tax deferrals for the standard contribution. The Roth slot is more valuable for the after-tax / mega-backdoor portion, where the tax has already been paid and Roth conversion is the move that makes the entire strategy work.

Common mistakes

  1. Front-loading deferrals. Hits the IRS limit early, costs match dollars the rest of the year (unless a true-up applies, which is plan-specific).
  2. Not capturing the full match. The match is the highest-confidence return in the package. Contribute at least enough every paycheck to receive it.
  3. Treating the standard deferral cap as the limit. The after-tax / mega-backdoor space is large and largely unknown.
  4. Leaving the company before the match vests. Run the numbers before accepting an outside offer; a sign-on bonus from the new employer can offset the lost match.
  5. Picking individual stocks in the brokerage window. The plan menu's institutional-share index funds are hard to beat after fees and tax friction.
  6. Rolling everything to an IRA on departure. Sometimes useful, sometimes not — leaving balances in the 401(k) preserves access to the institutional-share class index funds and can simplify backdoor Roth IRA mechanics if you have a pre-tax IRA balance to manage around. Worth thinking through before defaulting.

Amazon adjusts plan terms periodically. Verify match formula, vesting schedule, after-tax contribution feature, and conversion options in your benefits portal before acting on specifics.