Estimate your self-employment tax in Columbia for 2026: the 15.3% SE tax, the deductible half, federal income tax, state income tax, and quarterly payments.
Last updated: May 2026 · Data: MIT Living Wage Calculator, C2ER, U.S. Census, BLS, IRS, state and city sources
Columbia self-employed workers pay federal SE tax and federal income tax, plus Maryland state income tax (2% to 5.75%). Maryland has eight state income tax brackets plus county-level income taxes ranging from 2.25% to 3.2%. This means your total state+local income tax rate can exceed 9% in some counties.
| Net Profit | SE Tax | Half-SE Deduction | Total Est. Tax | Per Quarter |
|---|---|---|---|---|
| $30,000 | $4,239 | $2,119 | $6,105 | $1,526 |
| $50,000 | $7,065 | $3,532 | $12,045 | $3,011 |
| $75,000 | $10,597 | $5,299 | $20,091 | $5,023 |
| $100,000 | $14,130 | $7,065 | $29,839 | $7,460 |
| $150,000 | $21,194 | $10,597 | $49,816 | $12,454 |
Single filer, standard deduction. Total tax = SE tax + federal income tax + Maryland state tax. Estimates only.
Columbia is a large planned community between Baltimore and Washington in affluent Howard County, with an economy built on federal contracting and cybersecurity tied to nearby Fort Meade and the NSA, healthcare, and professional services, plus top-rated schools.
| Local Metric | Columbia (2026 estimate) |
|---|---|
| Metro population | 105,000 |
| County / jurisdiction | Howard County |
| Cost of living index (US avg = 100) | 125 |
| MIT living wage, single adult | $25.00/hour |
| MIT living wage, one earner supporting a family of four | $49.00/hour |
| Applicable minimum wage | $15.00/hour |
| Average rent, 1-bedroom | $1,900/month |
| Average rent, 2-bedroom | $2,300/month |
| Median home price | $520,000 |
| Median household income | $125,000/year |
| Combined sales tax rate | 6% |
| Effective property tax rate | 1% of value/year |
Local figures are 2026 estimates compiled from the MIT Living Wage Calculator, the C2ER Cost of Living Index, U.S. Census and Zillow housing data, and city and county sources. Verify current figures before relying on them.
The federal SE tax rate is 15.3% (12.4% Social Security plus 2.9% Medicare), the same in Columbia as everywhere. It applies to 92.35% of net profit; Social Security stops at $176,100 of net earnings.
Maryland taxes self-employment income as ordinary income (2% to 5.75%), so Columbia freelancers owe state tax on top of federal.
On $60,000 of net profit in Columbia, estimated total tax (SE plus federal plus state) is about $15,014, or roughly $3,754 per quarter.
Howard County levies a local income tax of 3.2% on residents, on top of Maryland state income tax. The calculators on this page show federal, Maryland, and FICA amounts, so Howard County residents should add the 3.2% local income tax on top. Maryland does not levy a separate local business income tax, but the state requires an annual report plus a personal property return for many LLCs, and Howard County applies its local income tax to the pass-through income of resident owners. Budget for the annual report fee and local income tax on top of the state LLC filing fee.
Business expenses that lower net profit (equipment, software, home office, mileage) reduce both SE tax and income tax. The deductible half of SE tax, self-employed health insurance, and retirement contributions reduce income tax.