401(k) Calculator with Employer Match

A 401(k) is a workplace retirement plan that lets you contribute a percentage of your pay before it reaches your bank account, under the rules of the plan. Many employers add a matching contribution tied to how much you put in. Think of the match as part of your total compensation that only arrives if you contribute. If two workers earn the same salary and one contributes enough to receive the full match while the other contributes nothing, the first worker is paid more in total, even though their paychecks before the 401(k) look similar. The match is not a bonus the employer adds out of goodwill at year end. It is a formula written into the plan document, it runs on a schedule the plan sets, and it rewards the act of contributing.

Plans describe that formula in tiers. A typical structure matches a percentage of the first slice of salary you contribute, and some plans add a second tier on the next slice at a different rate. The calculator above takes exactly those inputs: the tier 1 rate and the tier 1 cap as a percentage of salary, plus an optional tier 2 rate and cap. That matters because headlines often shorten the formula in a way that hides the cap. A match described as 50% sounds generous until you see it applies only to the first 6% of salary you contribute. Both numbers decide the dollars. Enter the formula from your summary plan description, not from a coworker summary or a benefits fair slide, and the projection will follow your plan rather than a generic one.

Vesting decides how much of the employer money is yours to keep if you leave. Your own contributions are always yours. Employer contributions may vest gradually over years of service or all at once after a set period, and the schedule is plan specific. Two workers with identical balances on paper can walk away with different amounts if one leaves before vesting. This calculator projects the full employer amount under the formula you enter so you can see the size of the match itself. Before you rely on that total for a job change decision, read your vesting schedule and check how much of the employer portion you have earned so far. Your plan statement or human resources office can give you the vested figure.

The most expensive habit in a matched plan is contributing less than the amount that earns the full match. The reason is mechanical. The match is calculated from what you actually contribute in each period. If the plan matches 50% of the first 6% of salary and you contribute 3%, the employer matches that 3% and stops. The other 3% of potential match for that period is not banked for later. Over a year the gap looks small. Over a career, the missed match plus the growth that money would have earned is a large and permanent difference. The calculator makes the year 1 gap visible as match left on the table, so you can see the cost of your current rate in dollars before you decide whether cash flow allows you to raise it.

Capturing the full match does not settle the question of how much to contribute in total. Contributing beyond the cap can still make sense for retirement saving, tax planning, or because the plan investments suit you. Contributing exactly to the cap can also be a reasonable step for someone paying down high interest debt or building an emergency fund outside the plan. What the cap gives you is a clear first milestone: at or above the cap, no part of the match formula goes unused. Below the cap, part of your compensation is unclaimed. Run the calculator at your current rate, then at the full cap rate, and compare the projected balances. The difference is the long run price of the gap, shown with the same salary growth and the same hypothetical return so the comparison is fair.

This tool does not enforce IRS limits. Statutory dollar limits and catch-up provisions change over time and depend on your situation, so this page does not print a limit figure for you to rely on. Check the current IRS guidance and your plan documents for the maximum you are allowed to contribute. If you are eligible for catch-up contributions and want to model them, simply enter a higher employee percentage in the calculator. The math treats that extra percentage the same way it treats any other contribution, which is the right way to see its effect on the balance and on whether you reach the match cap.

A projection that holds salary flat understates a percentage based plan. When pay rises, the same contribution percentage produces larger dollar deposits, and the match, also a percentage of salary, rises in step. In the worked example, the contribution climbs from $4,800 in year 1 to about $6,263 in year 10 without any change in the 6% rate, purely from 3% annual salary growth. Over ten years those rising deposits sum to $55,027 from you and $27,513 from the employer under the hypothetical formula. A flat salary model at $80,000 for all ten years would sum to $48,000 from you and $24,000 from the employer, and the ending balance would be lower as well because the later, larger deposits are missing entirely.

Growth also changes how to read the final year detail. A plan that feels affordable at 6% today will ask for more dollars at the same 6% after several raises. That is usually manageable because the raise funds the increase, but it is worth seeing in advance. Use the year by year table in the calculator to watch the contribution climb alongside the salary. If you plan to raise your percentage over time as well, model that as a second run with a higher percentage across all years, or as separate shorter runs, and compare. The honest approach is to test one change at a time so you know which assumption moved the ending balance.

The table uses the worked example inputs. All figures are hypothetical and shown only to demonstrate how a percentage of a growing salary produces growing dollar amounts at an unchanged contribution rate.

1. Contributing below the cap all year. The unused part of the match for that period is generally gone. If cash flow allows, contributing at least to the full tier caps is the first milestone to check, because it claims the whole formula you are offered.
2. Front loading contributions and missing per period matching. Some plans calculate the match each pay period rather than on annual totals. Contributing the whole year amount early can leave later pay periods with no contribution to match. Check how your plan times the match before you change the pattern of your deposits.
3. Counting unvested employer money as yours. The projected employer total assumes the amounts stay in the plan. If you leave before you are fully vested, part of that total may not go with you. Read the vesting schedule alongside any balance projection.
4. Using a coworkers match formula. Match tiers differ by employer and sometimes by division or hire date. Enter the rates and caps from your own plan document so the two tier math matches the plan you actually have.
5. Reading a smooth projection as a promise. The calculator grows the balance at one steady hypothetical rate. Real returns move up and down, fees reduce results, and taxes apply at withdrawal under the rules then in effect. Use the projection to compare choices, not to predict an account statement.
6. Ignoring plan limits and documents. This tool enforces no statutory limit and prints no limit figure. Contribution maximums, catch-up eligibility, loan rules, and withdrawal rules come from official guidance and your plan. Confirm them there before you act on a projection.

Start with your real inputs. Enter your current salary, a salary growth rate you can defend, your actual contribution percentage, and the match tiers copied from your plan document. Set the starting balance to what your statement shows and choose a horizon that matches the decision at hand, such as years to a planned retirement date or years you expect to stay in the plan. Run the projection and note four numbers: the projected balance, your total contributions, the employer total, and the year 1 match left on the table. Those four together tell you how much of the result is your money, how much is employer money, and whether any of the formula is going unused right now.

Then change one input at a time. Raise your contribution to the full tier caps and record the new balance. Extend the horizon by five years at the same rates. Lower the hypothetical return and see whether the plan still reaches a balance you find acceptable. Each single change teaches you something the headline number cannot: the value of the full match, the weight of extra years, and the sensitivity of the result to the return assumption. Keep in mind that the projection adds contributions at the start of each year. A plan that deducts from each paycheck spreads deposits through the year, so a real account will differ in detail. The comparison between your own scenarios remains useful because every run uses the same convention.