A blended tax rate is the weighted average of the different rates that apply to your income, expressed as a single percentage. The quickest way to find yours is to divide your total tax by your total taxable income. The longer way, which shows why the number lands where it does, is to multiply each rate by the share of income it covers and add the pieces together.
The Weighted Average Formula
The math is simple: (Rate A × Proportion A) + (Rate B × Proportion B) = Blended Rate. Extend it to as many rates as apply.
Say you have $100,000 of income where the first $60,000 is taxed at 10% and the remaining $40,000 at 20%. Tax on the first slice is $6,000; tax on the second is $8,000. Total tax of $14,000 divided by $100,000 gives a blended rate of 14%. The weighted formula gets you there the same way: (0.10 × 0.60) + (0.20 × 0.40) = 0.14.
Weighting is what separates a blended rate from a straight average. Averaging 10% and 20% would give 15%, which overstates the real burden because the lower rate covers a bigger share of the income.
Applying It to the Federal Brackets
Most individuals encounter a blended rate through the federal graduated brackets. Different slices of taxable income are taxed at increasing rates, so your marginal rate (the bracket your last dollar falls into) is almost always higher than your blended rate.
Take a single filer with $80,000 in taxable income for 2026. The first $12,400 is taxed at 10% ($1,240), the next $38,000 at 12% ($4,560), and the remaining $29,600 at 22% ($6,512), for a total of $12,312.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Dividing $12,312 by $80,000 gives a blended rate of about 15.4%. The marginal rate is 22%, but only the top slice of income is taxed at that rate. Moving into a higher bracket does not retax the income underneath it.
Mixing Ordinary Income and Capital Gains
The blended rate is most useful when your income is taxed under more than one schedule. The common case is wages or business income alongside long-term capital gains from assets held over a year, which qualify for preferential rates of 0%, 15%, or 20% depending on total taxable income.2Internal Revenue Service. Topic No. 409, Capital Gains and Losses For a single filer in 2026, the 0% rate applies while total taxable income stays under $49,450, 15% up to $545,500, and 20% above that.3Internal Revenue Service. Rev. Proc. 2025-32
Consider a single filer with $60,000 in wages and $60,000 in long-term capital gains. The wages run through the ordinary brackets: $1,240 at 10%, $4,560 at 12%, and $2,112 at 22% on the last $9,600, totaling $7,912. The $60,000 in gains stacks on top. Since ordinary income already crossed $49,450, all $60,000 of the gains falls in the 15% bracket, producing $9,000. Total tax is $16,912 on $120,000 of income, a blended rate of about 14.1%. The same $120,000 as pure wages would blend closer to 17.8%.
Surtaxes That Raise the Blend
Two federal surtaxes lift the blended rate for higher earners. The net investment income tax adds 3.8% on investment income (capital gains, dividends, rental income) for single filers with modified adjusted gross income over $200,000 and joint filers over $250,000.4Office of the Law Revision Counsel. 26 U.S. Code 1411 – Imposition of Tax The additional Medicare tax adds 0.9% on earned income above those same thresholds.5Internal Revenue Service. Topic No. 560, Additional Medicare Tax Neither threshold adjusts for inflation. When either applies, fold the extra tax into the numerator before dividing by total income.
Multi-State and Multi-Country Blends
For a business, the blended rate summarizes the combined burden across every jurisdiction. A corporation pays the 21% federal rate plus whatever state corporate income tax applies where it operates.6Office of the Law Revision Counsel. 26 U.S. Code 11 – Tax Imposed States use apportionment formulas built on sales, payroll, and property to decide how much of a multistate company’s income they can tax.
If 70% of a company’s income is apportioned to a state with a 6% rate and 30% to a state at 3%, the blended state rate is (0.06 × 0.70) + (0.03 × 0.30) = 5.1%. Adding the 21% federal rate puts the combined blended rate near 26.1%, before recognizing that state taxes are deductible on the federal return, which trims the real figure slightly.
Global companies do the same calculation on a wider scale: total worldwide tax divided by worldwide taxable income yields the global blended rate. This is the figure that appears in financial statements and moves when revenue shifts toward a lower-tax jurisdiction.
When a Rate Changes Mid-Year
If a corporate rate changes partway through a company’s fiscal year, tax gets computed under both the old and new rates and prorated by the number of days in the year that fell under each. The 2018 federal drop from a graduated structure topping out at 35% to a flat 21% forced this calculation on any corporation whose fiscal year straddled January 1, and the same method would apply to any future mid-year change.
Blended, Marginal, and Effective Rates Answer Different Questions
These three terms get mixed up constantly, and confusing them leads to bad planning.
The marginal rate is the rate on your next dollar. For a single filer in the 24% bracket in 2026, one more dollar of ordinary income costs 24 cents in federal tax. This is the rate for forward-looking decisions: taking on extra work, timing a capital gain, sizing a deductible contribution. It answers “what does one more dollar cost me?”
The blended rate is the weighted average of every statutory rate applied to your taxable income. It answers “what is the average rate across all of my taxable income?” Unless every dollar sits in the same bracket, the blended rate is lower than the marginal, because it includes everything taxed below the top slice.
The effective rate is total tax divided by a broader income figure, often adjusted gross income or total economic income rather than taxable income. Because the denominator is larger and the numerator reflects credits reducing the tax, the effective rate is usually the lowest of the three. It answers “what share of all my money actually went to taxes?”
One filer can carry all three. A single filer with $80,000 in taxable income sits at a 22% marginal rate, blends to roughly 15.4% across their brackets, and, if gross income was $100,000 and total tax after credits was $11,000, has an effective rate of 11%. Same return, three numbers, three different questions.