How Much Should I Contribute to My 401(k)?
Start with the percentage needed to get your full employer match. After that, choose the highest rate you can keep paying while still covering normal bills and unexpected expenses. There is no magic percentage that fits every paycheck.
The better question is not just, "What percentage should I use?" It is, "What does this rate do for my future balance, and can I actually stick with it?"
Start with the full employer match
Before choosing a rate, find the match formula in your benefits portal. If the plan matches 50% of contributions up to 6% of pay, you usually need to contribute 6% to get the full match. In that example, the employer contribution is 3% of pay.
On an $85,000 salary:
- A 6% employee contribution is $5,100 per year.
- A 50% match on that amount is $2,550 per year.
- Contributing 4% instead would usually leave part of the available match unused.
Your plan may have pay-period rules, eligibility dates, and vesting schedules that change the paycheck result. Confirm the formula in the summary plan description or benefits portal. The IRS explanation of retirement plan contributions also separates employee deferrals from employer matching contributions.
Choose a rate you can keep
A high rate that forces you to stop after two months is less useful than a steady rate you can keep all year. Check these items before increasing the percentage:
- Your full-match threshold. Falling below it may leave employer money unused.
- Your monthly cash flow. Leave enough room for housing, food, insurance, debt payments, and a basic emergency cushion.
- Your retirement timeline. A later start leaves fewer years for contributions and investment growth.
- Other retirement accounts. An IRA, pension, spouse's plan, or other savings can change the role your 401(k) needs to play.
- The annual employee limit. A percentage that looks reasonable can still reach the IRS limit on a higher salary.
If the full match is affordable, use it as the floor. If it is not affordable yet, pick a rate you can sustain and set a specific date to review it again.
Test a 1% increase
One percentage point is small enough to test without rebuilding your whole plan. On an $85,000 salary, 1% equals $850 per year, or about $70.83 per month before payroll taxes and contribution tax treatment.
Run the calculator twice:
- First with your current contribution rate.
- Then with a rate 1 percentage point higher.
- Keep salary growth, investment return, fees, and retirement age unchanged.
- Compare employee contributions, employer match, projected balance, and monthly income.
Changing one input at a time makes the comparison readable. If you change several assumptions at once, the result is harder to learn from.
Watch the annual limit
For 2026, the employee elective deferral limit for most 401(k) plans is $24,500. Eligible participants age 50 and older can use catch-up contributions, with a separate higher catch-up amount for ages 60 through 63. The IRS 2026 limits announcement provides the current amounts.
The limit applies to employee deferrals, not just the percentage shown in your payroll portal. If you change employers during the year, your combined employee contributions still matter. Keep records from both plans.
When to review your percentage
Review the rate after a pay increase, employer match change, job change, major debt payoff, or birthday that makes you eligible for catch-up contributions. Also check it near year-end if you are close to the employee limit.
Do not raise the percentage just because a calculator shows a larger future balance. Make sure the new paycheck amount still works. Markets, fees, taxes, inflation, and future income can all change.