Marginal vs effective tax rate: which number matters for which decision
By Skyler Bissell · August 6, 2026 · 7 min read
A single filer on $150,000 sits in the 24% federal bracket and hands the IRS about 15% of gross in federal income tax. Both numbers are correct at once. One of them prices your next raise; the other prices your life. Mixing them up is the most common tax mistake we see in relocation math, and it flatters or slanders whole countries depending on which direction it runs.
The marginal tax rate is the rate charged on your next dollar of income, set by the top bracket your income reaches plus any payroll taxes still running at that level. The effective tax rate is your total tax divided by your total gross income, the average across every bracket you climbed through. The marginal rate is always the higher of the two in a progressive system.
TL;DR
- Same salary, same country: a New York filer's marginal stack runs near 34 cents on the next dollar while the whole-income average sits several points below it. The two stacks.
- Marginal prices decisions at the edge: raises, bonuses, deductions, one more workday. Effective prices places. Which to use when.
- Across countries, only effective rates are comparable, and the spread at $150,000 runs from 19% in Singapore to 42% in Lisbon. The cross-border trap.
One salary, two true numbers
Take our engine's base case, a single filer on $150,000 with a 6% 401(k) deferral, and stand them in two US cities.
Seattle. Washington has no state income tax, so the marginal stack on the next dollar is the 24% federal bracket, 7.65% of FICA, and about 1.4% of Washington's wage levies: roughly 33 cents. The effective rate, the number that describes the whole year? 24.1%. Total tax $36,130, take-home $113,870.
New York. Add New York State's 6.0% bracket and the city's 3.876% flat tax and the marginal stack reaches about 34 cents federal-plus-local before Medicare, per the bracket tables New York State and the IRS publish. Effective: 31.1%, which is $46,607 of tax and $103,393 kept, 68.9% of gross.
Notice the shape of the gap. In both cities the marginal number is several points above the effective one, and the distance between them is everything the bracket system did on the way up: the standard deduction taxed at zero, the first dollars taxed at 10% and 12%, the 401(k) contribution that never entered taxable income at all. The mechanics of that climb get their own walkthrough in how tax brackets work.
Which number matters: a decision table
Neither rate is the better one. Each answers one kind of question and quietly lies about the other kind.
| Decision | Use this rate | Why |
|---|---|---|
| Valuing a raise or bonus | Marginal | New income lands on top of the stack and pays the top price |
| Valuing a 401(k) or pension deferral | Marginal | A deduction removes dollars from the top bracket first |
| A partner returning to work | Marginal, on the household | The second income starts where the first one stopped in joint systems |
| Budgeting your year | Effective | Your bank account receives the average, never the marginal |
| Comparing two cities or countries | Effective, same salary both sides | Bracket structures differ too much for top rates to mean anything |
The household row deserves its extra word. In a joint-filing system a returning second earner's first dollar is taxed at the household's marginal rate, which is how a $60,000 second salary can arrive home as $38,000 before childcare takes its share. That interaction, marginal rate times daycare bill, is the second-income trap, and it moves more family decisions than either number alone.
The cross-border trap
Nearly every "taxes in Europe" take you have read compares an American effective rate with a European marginal one. Denmark's famous 55%, Norway's wealth-tax headlines, Germany's 42% bracket: all marginal, all real, and none of them what a resident pays across a whole salary.
Run the same $150,000-equivalent salary through our engine as a single filer and the effective rates land like this. Each line is the whole year, tax plus employee contributions, at current exchange rates:
- Singapore: 19.1% effective, the floor of our published set.
- Seattle: 24.1%, with no state income tax doing quiet work.
- London: 30.8%, despite a 40% higher-rate bracket that starts above £50,270.
- New York: 31.1%, three governments deep.
- Oslo: 32.0%, Scandinavia priced by statute rather than by reputation.
- Berlin: 40.5%, and unlike every US line above, this one already contains health insurance.
- Lisbon: 42.3%, the steepest of these seven.
London two points below New York, Oslo one point above it: those are the comparisons the marginal-rate headlines never predict. And even the honest effective column is only the start of a relocation answer, because what the tax buys differs more than the tax does. The full country map is in how countries tax your salary, the 69-country table lives at take-home pay by country, and the number that nets taxes against childcare, healthcare and the rest is the equivalent salary the calculator computes for any pair of cities.
Where the confusion costs real money
Three recurring cases from our correction inbox and comment threads:
- Turning down overtime or a raise "because it puts me in a higher bracket." Only the dollars above the threshold pay the new rate. The raise always nets positive through the tax system itself; the places it can net negative are benefit cliffs, which are a different mechanism.
- Pricing a European offer at the top bracket. A candidate reads Germany's 42% and discounts a Berlin offer by nearly half. The effective reality at a $150,000-equivalent is 40.5%, health insurance included, and at the salary that matches a New York life, our engine measures Berlin's rate at 37.0%. Still high. But the offer got discounted by the wrong number.
- Valuing deductions at the effective rate. It runs the other way too: a 401(k) dollar saves at 24 cents for this filer, and modeling it at the effective rate undersells every pre-tax vehicle you have.
The pattern behind all three: the marginal rate belongs to the next dollar, the effective rate belongs to all the dollars, and every expensive mistake is one number doing the other one's job.
Finding your own two numbers
Both rates are readable off documents you already have. For the effective rate, take last year's return or a December payslip: total tax withheld plus employee contributions, divided by gross pay for the year. One division, no tables. For the marginal stack, find your top income-tax bracket for the year, then add every payroll tax that has not yet hit its cap at your salary. A Seattle filer at $150,000 adds the full 7.65% of FICA because the $184,500 Social Security wage base sits above them; a filer at $200,000 has cleared the base, so their Social Security marginal cost on the next dollar is zero and the stack shrinks even as the bracket rises.
Then keep the two numbers in their lanes. Marginal for the raise conversation this quarter. Effective for the city conversation this year.
FAQ
Why is my effective tax rate so much lower than my tax bracket?
Two mechanics. Deductions remove the first slice of income from tax entirely, and the bracket system charges the low rates on the way up, so 10% and 12% apply to your first dollars no matter how many dollars follow. Only the income above each threshold pays that threshold's rate. The bracket names the ceiling; the average of the whole stack is what you pay.
Which rate should I use to estimate taxes on a bonus?
The marginal stack, meaning your top income-tax bracket plus every payroll tax still running at your income level. A $10,000 bonus for a $150,000 Seattle filer loses about 33% (24% federal, 7.65% FICA, about 1.4% of Washington's wage levies), keeping roughly $6,700. Withholding on the bonus check may differ; the marginal stack is what you owe at year-end.
Is the effective tax rate the same as the tax wedge?
No. Our effective rate is employee-side: income tax plus employee payroll contributions, divided by gross salary, the number your payslip shows. The OECD tax wedge adds employer-side contributions on top and divides by total labor cost, so it runs higher and answers a different question, what your employment costs, versus what you keep.
Do countries with high marginal rates always have high effective rates?
No, and the gap between the two is where headlines mislead. Norway's top marginal rates support Scandinavia's tax reputation, yet its effective rate at a $150,000-equivalent salary is 32.0%, close to New York's. Meanwhile Lisbon reaches 42.3% effective without any single headline-grabbing bracket. Deductions, thresholds and payroll caps decide the average; the top bracket only decides the headline.
Next time a recruiter, a colleague or a headline hands you a single tax rate, ask which of the two it is. If it prices the next dollar, use it for the next dollar. If you are pricing a life somewhere, demand the average, then run the two cities and see what survives contact with the rest of the ledger.
Sources. US federal brackets and rates are published by the IRS, New York State and City rates by the New York State Department of Taxation and Finance. Effective rates are computed by cityparity's per-city engine from each country's statutory brackets and contributions; per-field provenance is in data/_meta.json.
Figures here come from cityparity's per-city engine and were current at publication; brackets and exchange rates move, so treat any single number as a strong estimate and run your own inputs. See the methodology.