Pre-Tax Deferrals and Your Paycheck: What $6,000 Actually Saves

You put $6,000 into your 401(k) before tax. What did it actually save you?

On an $85,000 salary as a single filer: $1,320 of federal income tax, somewhere between $0 and $558 of state income tax, and nothing at all in FICA.

That last part is the one people get wrong, and it is the reason a deferral is worth less than the "my marginal rate is 22% plus 7.65% payroll" arithmetic suggests.

A note before you start. This is general education, not tax advice. Figures are computed by this site's own tax engine for tax year 2026 on a single filer taking the standard deduction, using federal figures from IRS Revenue Procedure 2025-32. Contribution limits change annually and are not the subject of this article.

1. The three taxes, and which ones a deferral touches

Your paycheck is reduced by three separate things, and a traditional 401(k) deferral behaves differently against each.

The FICA row is the important one.

On $85,000 with no deferral, FICA is $6,503. On $85,000 with $6,000 deferred, FICA is $6,503. Identical. Social Security and Medicare are levied on your gross wages before any elective deferral comes out, so deferring moves nothing out of that base.

Why this matters: people commonly reason that their "real" marginal rate is 22% federal plus 7.65% payroll plus their state rate, and conclude a deferral saves close to a third. It does not. The payroll component is not in play.

2. The federal saving is the same everywhere

Deferring $6,000 on $85,000 moves federal income tax from $9,870 to $8,550.

A $1,320 saving — exactly 22% of $6,000, because $85,000 puts a single filer in the 22% bracket and the deferral comes off the top of the stack.

That figure is identical in all fifty states, because federal brackets do not vary by state. It is the bulk of what a deferral is worth, and it is the part nobody needs a state-by-state table for.

The rate that applies is your marginal rate, not your effective one. On $85,000 a single filer's effective federal rate is about 11.6%; the deferral saves at 22%. That gap is the entire reason deferring is worth more the more you earn — and why a raise never costs you money is the same arithmetic read in the other direction.

3. The state saving ranges from $558 to nothing

Same salary, same $6,000, seventeen states:

The spread from top to bottom is $558 — the whole state-level variation in what a $6,000 deferral is worth.

Two states are at $0 for completely different reasons, and section 4 is about the second one.

Texas and Florida are at $0 because there is no state income tax to save. Nothing is being denied; there is simply nothing there. The same is true in Alaska, Nevada, New Hampshire, South Dakota, Tennessee, Washington and Wyoming.

North Dakota's $117 is small for a subtler reason. Its lowest bracket is 0% and its return starts from federal taxable income, so at $85,000 the state bill is only $377 to begin with. Defer enough — $23,500, the elective limit — and North Dakota's bill reaches exactly zero.

4. Pennsylvania taxes the contribution instead

Pennsylvania is the exception in the table, and it is not a rounding difference.

Pennsylvania does not start from a federal figure. It taxes eight enumerated classes of income, one of which is compensation, and an employee's elective deferral is compensation in the year it is made. The Department of Revenue's Personal Income Tax Guide puts it directly: contributions to an eligible Pennsylvania retirement plan are includable in compensation and taxable in the year made.

So on $85,000, a Pennsylvanian deferring $6,000 pays $2,610 of Pennsylvania tax — exactly what they would have paid deferring nothing.

This site's own engine got this wrong until it was fixed. It subtracted the deferral from every state's wage base, because that is what the federal calculation does, and it invented a $184 Pennsylvania saving that does not exist. The treatment is now recorded per state as sourced data rather than inferred, and a test fails if a state ever claims it without a citation.

The other half of the bargain is real and worth stating. Because the contribution was already taxed, Pennsylvania generally does not tax the distribution later — a qualifying withdrawal from an eligible Pennsylvania retirement plan by someone who has retired on the plan's age or service terms comes out untaxed by the state.

So Pennsylvania taxes the money once, at the front instead of the back. It is a trade, not a penalty. But if you are deciding how much to defer this year, on this paycheck, the state saving other states offer is not available to you, and a calculator that shows one is wrong.

5. An HSA beats a 401(k) by $459 on the same $6,000

This is the most actionable thing on the page.

A health savings account contribution made through payroll escapes FICA as well as income tax. A 401(k) deferral does not.

Same $85,000, same $6,000, California:

$459 better, which is 7.65% of $6,000 — the whole FICA rate.

And it works identically in a no-income-tax state. In Texas the same comparison is $69,948 against $70,407 — the same $459, because the advantage is a payroll tax advantage and payroll tax does not vary by state.

Three honest caveats:

It must be a payroll contribution. An HSA contribution you make yourself from a bank account is deductible for income tax but does not escape FICA — the exemption runs through your employer's cafeteria plan, not through the deduction.

You must be eligible, which requires being covered by a qualifying high-deductible health plan and not covered by disqualifying other coverage.

And the money is for medical expenses, with a penalty for other withdrawals before a threshold age. It is not a general-purpose retirement account, even though it functions like one after that age.

Section 125 premiums — your health, dental and vision premiums paid through the employer's plan — escape FICA the same way, and most people already have that without knowing it.

6. Your take-home falls by more than your tax saving

This is the arithmetic that surprises people at the first paycheck after they increase a deferral.

A Californian on $85,000 deferring $6,000:

The tax saving is $1,878. The spendable pay drops $4,122.

Both are true and they are not in conflict. The $6,000 left your paycheck; $1,878 of it came back as tax you did not pay; the remaining $4,122 is yours, in your 401(k), not spent.

The useful way to say it: $6,000 in the account costs you $4,122 of spending money. That is the number to budget against, and it is smaller than $6,000 in every state — in Texas or Pennsylvania it is $4,680.

7. The same $6,000 is worth twice as much at $200,000

Because a deferral saves at your marginal rate, its value changes with your salary and not with the amount deferred.

The same $6,000, California, five salaries:

At $200,000 the same contribution is worth $1,998. At $45,000 it is worth $960 — barely half, for exactly the same $6,000.

Three things that table shows and a summary would hide:

The jump is at the bracket, not at the salary. $85,000 and $120,000 save the identical $1,878, because both sit in the 22% federal bracket and both are past the top of California's relevant band. Fifty per cent more income, no extra benefit from deferring.

The state component stops moving before the federal one does. California's saving is $240 at $45,000, $360 at $60,000, and then $558 from $85,000 all the way to $200,000 — it flattens as soon as the deferral is coming entirely out of one state band.

And the cash cost falls as the saving rises. At $45,000, putting $6,000 in the account costs $5,040 of spending money. At $200,000 it costs $4,002. The account balance is the same $6,000 either way — the difference is entirely tax you did not pay.

The practical reading: a deferral is at its weakest exactly when money is tightest. At $45,000 you give up $5,040 of spending to save $960. That is still a real 16% return before the money has been invested at all, and it is a much thinner argument than the one people making $200,000 are working from.

8. Where deferring is worth the most

Three factors, in order of how much they move the answer.

Your federal marginal bracket. This dominates everything. A deferral at the 12% bracket saves $720 on $6,000; at 22% it saves $1,320; at 24% it saves $1,440. The state variation in section 3 spans $558 — less than one federal bracket step.

Your state's marginal rate. Worth $0 to $558 on $6,000 at this salary. Real, and secondary.

Whether the vehicle escapes FICA. Worth a flat $459 on $6,000, and available only through an HSA or a Section 125 plan.

The factor that is not on this list is the state you retire in. A deferral is a bet that your rate when you withdraw is lower than your rate now. Moving from California to a no-income-tax state in retirement makes that bet pay twice — but nothing on this page can price that, because it depends on decisions you have not made yet.

9. Four things people get wrong

"It saves me 22% plus 7.65%." It saves 22% plus your state rate. FICA is untouched by a 401(k) deferral — see section 1.

"A Roth 401(k) saves the same tax." It saves none now. A Roth deferral is made from after-tax pay, so your current-year tax and take-home are identical to not deferring at all, and the benefit is that qualifying withdrawals come out untaxed later. Every figure on this page is for a traditional deferral.

"I should defer to drop into a lower bracket." Dropping a bracket is not the goal and mostly is not possible — brackets apply slice by slice, so deferring $6,000 saves 22% on $6,000, not 22% on everything. There is no cliff to fall off.

"My employer match is part of my deferral." It is not, for any figure here. An employer contribution is not your elective deferral, does not count against your elective limit, and does not affect your paycheck's tax lines.

10. Where to see your own numbers

Every figure on this page is computed, not estimated. Change the salary, the state, and the deferral and watch all three tax lines move:

• Take-home pay calculator — with a deferral field.
• Marginal vs. effective tax rate — why the saving is at your marginal rate.
• What the nine no-income-tax states charge instead — where the state column is $0.

Frequently asked questions

How much does a 401(k) contribution actually save me? On $85,000 as a single filer, deferring $6,000 saves $1,320 of federal income tax in every state, plus $0 to $558 of state income tax depending on where you live, and $0 of FICA. In California the total is $1,878; in Texas and Pennsylvania it is $1,320.

Does a 401(k) contribution reduce Social Security and Medicare tax? No. FICA is levied on gross wages before an elective deferral comes out. On $85,000, FICA is $6,503 whether you defer nothing or $6,000.

Does an HSA save more than a 401(k)? On the same contribution, yes — $459 more on $6,000, which is the full 7.65% FICA rate, because a payroll HSA contribution escapes FICA and a 401(k) deferral does not. It must be a payroll contribution through your employer's plan; one you make yourself from a bank account is income-tax deductible but not FICA-exempt.

Does a 401(k) contribution reduce my Pennsylvania tax? No. Pennsylvania taxes elective deferrals as compensation in the year they are made. The corollary is that it generally does not tax qualifying distributions later, so the money is taxed once rather than twice — but there is no state saving in the year you defer.

Why did my take-home drop by more than my tax saving? Because the deferral itself left your paycheck. On $85,000 in California, deferring $6,000 cuts your tax by $1,878 and your spendable pay by $4,122 — the difference is the money now sitting in your account.

Is deferring worth it if I might move states? It can be worth more. A deferral is a bet that your tax rate when you withdraw is lower than your rate now, and retiring in a no-income-tax state makes the state half of that bet pay. Nothing on this page prices that, because it depends on a decision you have not made.

Does a Roth 401(k) cut my tax now? No. A Roth deferral comes from after-tax pay, so your current-year tax and take-home are the same as not deferring. Every figure here is for a traditional deferral.

Should I defer enough to drop a tax bracket? That is not how brackets work — they apply slice by slice, so a deferral saves your marginal rate on the amount deferred and nothing more. There is no cliff, and no reason to target a threshold.

What to do next

The federal saving is most of it, the state saving is real and secondary, and FICA is untouched unless you use the right account.

• Take-home pay calculator — your salary, your state, your deferral.
• Marginal vs. effective tax rate — the rate a deferral actually saves at.
• The twelve states with local income tax — where the state figure is not the whole bill.
• Your paycheck in the USA in 2026 — all fifty states.

Every figure on this site is sourced and dated. How we source every number.

Figures are computed by this site's own tax engine for tax year 2026 on a single filer taking the standard deduction with no dependents, using federal figures from IRS Revenue Procedure 2025-32. Pennsylvania's treatment of elective deferrals is recorded in this site's dataset from the Pennsylvania Department of Revenue's PA Personal Income Tax Guide, 'Gross Compensation' chapter; the engine applied the ordinary federal treatment to Pennsylvania until 2026-09-01, and that is corrected in the figures here. HSA and Section 125 FICA treatment is modelled through the engine's FICA-exempt deferral input. Contribution limits, HSA eligibility rules and employer match arrangements are outside this article's scope. This is general education and not tax advice.