Your 401(k) &
Mega Backdoor Roth guide
Most people at their first tech job leave thousands of dollars on the table by not understanding their retirement benefits. This guide covers everything — from Day 1 contributions to the advanced Mega Backdoor Roth strategy used at Google, Meta, Apple, and Microsoft.
Step 1 — The foundation
What is a 401(k) and why does it matter?
A 401(k) is a retirement account offered through your employer. Every dollar you contribute reduces your taxable income today (Traditional) or grows tax-free forever (Roth). At a tech company, your employer typically matches a portion of what you put in — that’s free money you should never leave on the table.
2026 contribution limits
Traditional 401(k) vs Roth 401(k)
| Feature | Traditional 401(k) | Roth 401(k) |
|---|---|---|
| Tax treatment now | Pre-tax — reduces income today | Post-tax — no immediate benefit |
| Tax treatment in retirement | Taxed on withdrawal | Tax-free withdrawals |
| Best for | High earners now, lower income in retirement | Early career, expecting higher taxes later |
| Income limits | None | None |
| Required Minimum Distributions | Yes at age 73 | No (after 2024 SECURE 2.0) |
| 2026 contribution limit | $24,500 (shared) | $24,500 (shared) |
💡 New to tech? Default to Roth 401(k)
If you’re early in your career, you’re likely in a lower tax bracket now than you will be in 10–20 years. Paying taxes now at a lower rate and getting tax-free growth forever is usually the better deal. Many tech companies (Google, Meta, Microsoft) offer both options — pick Roth unless you’re already in the 37% bracket.
Always get the full employer match first
Find out your company’s match
Most tech companies match 50% of your contribution up to 6% of salary, or dollar-for-dollar up to 3–4%. Check your offer letter or ask HR. This is an instant 50–100% return on your money.
Contribute at least enough to get the full match
If your company matches 50% up to 6%, contribute at least 6% of your salary. Anything less is leaving free money behind. On a $150,000 salary that’s $4,500/year you’re missing out on.
Check the vesting schedule
Your contributions are always yours. Employer match may vest over 1–4 years — meaning if you leave early, you could lose some of it. Know your vesting schedule before deciding to switch jobs.
Max out your contribution
After getting the full match, try to contribute the maximum $24,500/year. On a $200,000 tech salary that’s about 12% of your pay — very achievable with a starter budget.
What to invest in
Target Date Fund (easiest)
Pick the fund closest to your expected retirement year (e.g. “2060 Fund”). It automatically adjusts from aggressive to conservative as you age. Zero maintenance required — set it and forget it.
Total Market Index Fund
A low-cost fund tracking the entire US stock market (like Vanguard VTSAX or Fidelity FZROX). Very low expense ratios (0.01–0.03%). Slightly more control than a target date fund.
Avoid company stock
Never put more than 5–10% of your 401(k) in your employer’s stock. Your income already depends on the company — don’t let your retirement depend on it too. Enron employees lost everything this way.
Watch the expense ratio
The expense ratio is the annual fee the fund charges. Pick funds with expense ratios below 0.10%. A 1% fee vs 0.03% fee costs you ~$150,000 over 30 years on a $100K investment.
⚠ Early withdrawal penalty
Withdrawing from a 401(k) before age 59½ triggers a 10% penalty on top of income taxes. Don’t touch this money — it’s for retirement only. Keep a separate emergency fund (3–6 months of expenses) so you never need to raid your 401(k).
Advanced strategy
The Mega Backdoor Roth — up to $47,500 extra in Roth per year
The Mega Backdoor Roth is one of the most powerful wealth-building strategies available to tech employees. If your company supports it, you can contribute up to $47,500 in after-tax dollars to your 401(k) and convert it to Roth — on top of your regular $24,500 Roth 401(k) contribution. That’s potentially $72,000 in Roth accounts in a single year.
🏢 Which tech companies support Mega Backdoor Roth?
Google, Meta, Apple, Microsoft, Amazon, Nvidia, and many other large tech companies support this. Smaller startups often don’t. Check your plan documents or ask your HR/benefits team: “Does our 401(k) plan allow after-tax contributions and in-plan Roth conversions?”
How it works — 3 steps
Max out your regular 401(k) first
Contribute the full $24,500 (2026) to your regular pre-tax or Roth 401(k). This is separate from after-tax contributions. Do this first.
Make after-tax 401(k) contributions
After maxing the regular limit, contribute additional after-tax dollars up to the total plan limit ($72,000 minus your contributions and employer match). These are not the same as Roth 401(k) contributions — they’re a third bucket most people don’t know exists.
Convert to Roth immediately
Convert the after-tax contributions to Roth as soon as possible — either via in-plan Roth conversion or in-service withdrawal to a Roth IRA. Convert immediately to minimise taxes on any earnings. This is the “backdoor” — your after-tax principal converts tax-free.
Example: $200,000 salary, 5% employer match
Here’s what your 2026 Mega Backdoor Roth could look like
$24,500 regular Roth 401(k) + $37,500 converted after-tax = $62,000 in Roth accounts. The $10,000 employer match goes into a pre-tax bucket.
Two ways to convert
In-plan Roth conversion
Convert after-tax contributions directly to a Roth 401(k) within the same plan. Simplest option — no separate accounts needed. Available at most large tech companies. Money stays in the 401(k) plan.
In-service withdrawal to Roth IRA
Roll after-tax contributions out to a Roth IRA while still employed. More flexible investment options outside the 401(k). Not all plans support this. Check with your plan administrator.
⚠ Convert immediately — don’t let earnings accumulate
After-tax contributions are not taxed on conversion, but any earnings on those contributions ARE taxable. Convert as soon as possible after each contribution (ideally same day or within days) to minimise the taxable earnings. This is why it’s called “convert immediately” in the strategy.
💡 How to set it up at your company
Log into your 401(k) portal (Fidelity, Vanguard, Schwab, Empower, etc.). Look for “after-tax contributions” or “voluntary after-tax” as a separate contribution type. Set up automatic conversion to Roth if your plan supports it (called “auto-conversion” or “automatic in-plan Roth conversion”). If you can’t find it, call your plan administrator or HR benefits team.
Regular Roth IRA vs Mega Backdoor Roth — what’s the difference?
| Feature | Regular Roth IRA | Mega Backdoor Roth |
|---|---|---|
| 2026 limit | $7,500 ($8,600 if 50+) | Up to $47,500 |
| Income limit (single) | Phases out $153K–$168K | No income limit |
| Income limit (married) | Phases out $242K–$252K | No income limit |
| Requires employer plan | No — open at any brokerage | Yes — plan must support it |
| Tax on conversion | N/A | Principal tax-free (earnings taxed) |
| Ideal for | Anyone under income limit | High earners at supporting companies |
The full picture
Order of operations — where to put your money first
When you join a tech company, you suddenly have more money than before. Here’s the exact sequence to follow for maximum wealth building. Don’t skip steps or do them out of order.
Build emergency fund first
3–6 months of expenses in a high-yield savings account (HYSA). This prevents you from ever needing to touch retirement accounts early. Do this before everything else.
401(k) up to the employer match
Contribute exactly enough to get the full employer match. This is an immediate 50–100% return. Nothing beats it. Even a 1% match is free money — always capture it fully.
Max out your HSA (if eligible)
If you have a High Deductible Health Plan (HDHP), max your HSA first before maxing 401(k). HSA is the only triple-tax-advantaged account — pre-tax contributions, tax-free growth, tax-free withdrawals for medical. 2026 limit: $4,400 individual, $8,750 family.
Max out Roth IRA ($7,500 in 2026)
Open a Roth IRA at Fidelity, Vanguard, or Schwab and max it out. More investment flexibility than a 401(k). If you earn over $168,000 (single) or $252,000 (married), use the regular Backdoor Roth strategy instead.
Max out your 401(k) ($24,500 in 2026)
Now go back and max the full 401(k). Contribute $24,500/year — use Roth 401(k) if you’re early career, Traditional if you’re in a very high tax bracket now.
Mega Backdoor Roth (if your plan supports it)
After steps 1–5, contribute after-tax dollars to your 401(k) up to the $72,000 total limit and convert to Roth. At this step you could have $62,000+ going into Roth accounts in a single year.
Taxable brokerage account
After maxing all tax-advantaged accounts, invest remaining savings in a taxable brokerage (Fidelity, Vanguard, Schwab). Buy low-cost index funds. No contribution limits, but you pay capital gains tax on growth.
2026 limits quick reference
| Account | 2026 Limit | Tax benefit | Income limit? |
|---|---|---|---|
| 401(k) — employee | $24,500 | Pre-tax or Roth | None |
| 401(k) — catch-up (50–59, 64+) | +$8,000 | Pre-tax or Roth | None |
| 401(k) — super catch-up (60–63) | +$11,250 | Pre-tax or Roth | None |
| Total 401(k) plan limit | $72,000 | All buckets combined | None |
| Roth IRA | $7,500 | Tax-free growth | Yes ($168K single) |
| HSA (individual) | $4,400 | Triple tax advantage | HDHP required |
| HSA (family) | $8,750 | Triple tax advantage | HDHP required |
| Mega Backdoor Roth (max) | ~$47,500 | Roth after conversion | Plan must support |
💡 On Day 1 at your new tech job — do these 3 things
1. Log into your 401(k) portal and set contribution to at least the match amount (or max $24,500 if you can afford it). 2. Select Roth 401(k) if you’re early career. 3. Pick a low-cost index fund or target date fund. Most people do nothing on Day 1 and lose months of compounding — don’t be most people.
💡 The power of starting early — compound growth example
Starting at 25 vs 35 makes a massive difference. $24,500/year at 7% average return: starting at 25 = ~$5.8M by 65. Starting at 35 = ~$2.7M by 65. That’s a $3.1M difference from 10 years of delay. Time in market beats timing the market — start now, even if the amount is small.