Tax Preparation for Federal Government Contractors
Northern Virginia is home to one of the largest federal contractor workforces in the country. Whether you bill on W-2, 1099, or through your own LLC or S-corp, the tax side of contracting has layers that most general tax preparers don't fully understand.
The Tax Reality for Federal Contractors
Federal contractors in the DC metro area span every employment arrangement imaginable. Some are W-2 employees of a large prime contractor. Some are independent consultants billing directly to an agency on a 1099. Many work both simultaneously: a full-time W-2 job plus one or two side contracts they run through their own LLC. Each of those arrangements has different tax obligations, and mixing them without a plan is where most contractors run into trouble.
The W-2 side gets handled automatically through payroll. The 1099 and LLC sides do not. Self-employment tax, quarterly estimated payments, home office deductions, per diem for travel to client sites, and retirement contributions through a SEP-IRA or Solo 401(k) are all in play. Miss them and you either overpay or get hit with penalties.
LMN Tax has worked with government contractors in Manassas, Gainesville, Woodbridge, Centreville, and across Northern Virginia. If your income situation involves more than one column on the IRS forms, we've seen it before.
Common Tax Mistakes Federal Contractors Make
These are the issues that come up most often when contractors come to LMN Tax.
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Not paying quarterly estimated taxes on 1099 or LLC income
Your W-2 employer withholds taxes, but your contract income does not. The IRS expects estimated payments four times per year on income that isn't withheld. Miss those payments and you'll owe a penalty at filing regardless of whether you pay the full amount owed in April.
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Not accounting for self-employment tax on contract income
W-2 employees split Social Security and Medicare taxes with their employer. When you bill on 1099 or through your own entity, you pay both the employee and employer share. That's 15.3% on net self-employment earnings before income tax even starts. Most contractors who are new to 1099 income significantly underestimate what they'll owe.
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Missing home office and equipment deductions
Self-employed contractors who work from home may be able to deduct a portion of home expenses, internet, phone, and equipment. W-2 employees cannot. Knowing which side of that line you're on matters, and the rules for what qualifies are specific.
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Corp-to-corp billing set up without understanding the tax obligations
Many contractors form an LLC to bill clients corp-to-corp and gain more control over their income. But the entity doesn't change the self-employment tax exposure by itself. Without the right structure and payroll setup, the tax picture may be worse than just billing on 1099 directly.
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Not using retirement contributions to reduce taxable income
Self-employed contractors can contribute to a SEP-IRA or Solo 401(k) and deduct those contributions from taxable income. Many contractors earning $100,000 or more in contract income don't know about these options or assume they're only for people with employees. They're not.
How LMN Tax Helps Government Contractors
- Tax preparation for contractors with W-2 plus 1099 mixed income
- Quarterly estimated tax calculation and payment planning
- Self-employment tax review and deduction strategy
- Home office and equipment deduction review for self-employed contractors
- Business travel and per diem deduction handling
- LLC and S-corp structure review for contractors billing corp-to-corp
- SEP-IRA and Solo 401(k) contribution planning to reduce taxable income
- Bookkeeping setup for contractors who want clean records year-round
Related Services
Federal Contractor in Northern Virginia?
Talk to LMN Tax about your situation. Whether you're billing on 1099 for the first time, running contracts through your own LLC, or trying to figure out whether your W-2 withholding is enough to cover everything you owe.
10432 Balls Ford Rd, Suite 300, Manassas, VA · (By Appointment Only)
Government Contractor Tax Questions
I work as a W-2 employee but also bill one contract on 1099. How does that affect my taxes?
Your W-2 employer withholds taxes on your salary, but no taxes are withheld on your 1099 income. The 1099 income is also subject to self-employment tax (15.3% on net earnings), which your W-2 income is not. Most contractors in this situation are surprised by how much they owe in April because their W-2 withholding doesn't cover the self-employment tax on the contract side. You should generally make quarterly estimated payments on the 1099 income. See IRS Publication 505 for estimated tax rules.
I bill through my own LLC. What taxes does that create?
If your LLC is a single-member LLC with no S-corp election, it's taxed as a sole proprietorship by default. All net income passes through to your personal return and is subject to self-employment tax. You're responsible for quarterly estimated payments. If your net profit is consistently high, an S-corp election may reduce self-employment tax exposure, but it adds payroll requirements. LMN Tax can review your current setup and tell you whether any change makes sense for your numbers. See IRS Publication 334 for the tax guide for small business.
Can I deduct my home office if I work remotely on a federal contract?
If you are self-employed or billing through your own entity, a home office deduction may be available if the space is used regularly and exclusively for business. W-2 employees cannot deduct home office expenses under current tax law. For self-employed contractors, IRS Publication 587 (Business Use of Your Home) governs the rules and calculation methods.
What per diem and travel expenses can I deduct as a contractor?
Self-employed contractors can deduct ordinary and necessary business travel expenses, including transportation, lodging, and meals at the 50% deduction rate. The IRS sets standard per diem rates by location each year. W-2 employees generally cannot deduct unreimbursed travel expenses. See IRS Publication 463 (Travel, Gift, and Car Expenses) for the full rules.
I'm self-employed as a contractor. Can I set up a retirement account to reduce my taxes?
Yes. Self-employed individuals can contribute to a SEP-IRA or Solo 401(k) and deduct those contributions from taxable income. A SEP-IRA allows contributions up to 25% of net self-employment income (subject to annual IRS limits). A Solo 401(k) allows both employee and employer contribution components and often allows higher contributions at the same income level. IRS Publication 560 (Retirement Plans for Small Business) covers the options in detail.