To prove loss of income in a personal injury claim, you need two categories of evidence working together: medical records showing that your injury kept you from working, and financial records showing what you would have earned during that time. Pay stubs alone will not carry the claim, and neither will a doctor’s note. The insurance adjuster or opposing counsel will attack whichever side you neglect, so both have to be built out carefully from the start.
Medical Proof Comes First
Every lost income claim rests on a treating physician’s records that spell out your diagnosis, the treatment timeline, and the specific restrictions that kept you off the job. A note reading “patient should rest” is weak. A note stating “patient cannot sit for more than 20 minutes, cannot lift more than 10 pounds, and is unable to perform office duties until [date]” gives the claim teeth.
Your medical records need to cover the entire period you missed work. If you had surgery in March and returned in June, your chart notes, post-operative instructions, and follow-up visit records should account for each of those months. Gaps in treatment during a claimed absence are one of the easiest ways for the other side to challenge your numbers. If the doctor cleared you to return on a specific date, any wages you claim beyond that date need a separate medical justification.
This is where most claims quietly lose value. People focus on gathering financial paperwork and treat the medical side as obvious. Without a continuous medical record linking the injury to your inability to work, even perfectly documented earnings will not get you paid.
Financial Documents That Establish What You Earned
Once the medical foundation is in place, you need paperwork proving your pre-injury income. What that paperwork looks like depends on how you get paid.
If You Are a W-2 Employee
Start with pay stubs from the weeks and months before the injury. They show your rate of pay, regular hours, and any consistent overtime. W-2 statements from prior years fill in the broader earnings picture and demonstrate year-over-year stability or growth. If you regularly worked overtime, the stubs need to show a pattern, not one or two outlier weeks.
An employer verification letter carries real weight. Get it on company letterhead with your job title, pay rate, typical weekly schedule, and the exact dates you missed. If you were in line for a raise, promotion, or bonus and your employer will confirm it in writing, add that too.
If You Are Self-Employed or an Independent Contractor
Without an employer to vouch for your income, tax returns become the backbone of the claim. Schedule C, which reports profit or loss from a sole proprietorship, matters because it shows net earnings after business expenses.1Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship) Two to three years of returns help establish a baseline and smooth out seasonal swings.
Form 1099-NEC documents nonemployee compensation paid by each client, which corroborates your gross income.2Internal Revenue Service. About Form 1099-NEC, Nonemployee Compensation Layer on invoices from the months leading up to the injury, bank statements confirming payment, and any contracts or emails for jobs you lost while recovering. A signed $15,000 contract that fell through during your recovery is direct evidence of a specific missed opportunity.
If You Own a Business
When you own the business, the claim gets more complicated because you have to separate your personal income loss from the company’s overall performance. Profit and loss statements from before and after the incident can show a revenue decline or increased costs tied to your absence, like hiring a temporary replacement or losing a key client relationship you personally managed.
Corporate tax returns on Form 1120 report the company’s income, losses, and deductions along with financial statement reconciliations that help verify the business’s trajectory.3Internal Revenue Service. About Form 1120, U.S. Corporation Income Tax Return Bank statements showing a cash flow drop that lines up with your absence reinforce the link between the injury and the financial impact.
Calculating What You Lost
With documentation assembled, you need a concrete dollar figure. The math is straightforward for most employees and more nuanced for anyone with variable earnings.
For hourly workers, multiply your hourly rate by the number of hours missed. Include consistent overtime if your stubs show a pattern. If you averaged 8 hours of overtime per week for the six months before the injury, those hours count. Missing 80 regular hours at $25 per hour plus 20 overtime hours at $37.50 comes to $2,750, not the $2,000 you would get counting only regular time.
For salaried employees, divide your annual salary by 2,080 (the standard number of working hours in a year) to get an hourly equivalent, then multiply by the hours missed. A $65,000 salary works out to roughly $31.25 per hour. Two weeks out means about $2,500 in lost base pay.
Self-employed people and business owners rely on averaging. Take net income from the past one to three years of tax returns, calculate a weekly or monthly average, and multiply by the time you were unable to work. If income fluctuates seasonally, use the same period from prior years rather than an annual average. A landscaper injured in June should not be averaging in slow winter months.
Bonuses, Commissions, and Overtime
Lost income is not limited to base wages. Bonuses, commissions, overtime, and tips are all recoverable when you can show a track record. The extra compensation has to have been reasonably expected, not speculative. Three years of consistent December bonuses documented on pay stubs or W-2s makes a strong case. A one-time bonus you heard might happen does not.
Fringe Benefits
If you lost employer-sponsored health insurance during your absence and paid for COBRA or marketplace coverage, the difference in premium costs is a compensable loss. The same goes for lost employer retirement contributions, accrued pension benefits, or stock options that vested during the period you were out. These amounts add up quickly and are routinely overlooked.
Paid Time Off You Used
A common misconception is that using sick days or vacation time to cover your absence means you have no lost wage claim. That is not how it works. Those PTO days belonged to you as part of your compensation, and burning them to recover from someone else’s negligence is a real financial loss. The monetary value of the consumed PTO is generally recoverable.
Proving Future Lost Income When the Injury Is Permanent
When an injury permanently limits your ability to earn, the claim extends beyond the wages you have already missed. Future lost income, sometimes called loss of earning capacity, projects what you would have earned over the rest of your working life. This is a separate category of damages, and the numbers can get large.
Medical documentation drives this claim too, but the focus shifts from treatment notes to long-term prognosis. You need a physician’s report detailing any permanent impairment rating, ongoing functional limitations, and specific work restrictions. A report stating you can no longer stand for more than 30 minutes or perform repetitive gripping tells a much clearer story than a vague statement about “reduced capacity.”
Evidence of your career trajectory before the injury also matters. Records of promotions, raises, professional certifications, or advanced degrees you were pursuing all support the argument that your earnings were headed upward. A 28-year-old apprentice electrician on track to become a licensed journeyman has a very different future earnings curve than someone in the same role with no advancement plans.
Vocational Experts
A vocational expert evaluates how your injury affects your employability. They review your work history, education, skills, and medical restrictions, then identify what jobs you can still realistically perform. By comparing your pre-injury earning capacity to your post-injury capacity, the expert quantifies the gap. Their analysis often includes labor market surveys confirming that the alternative jobs actually exist in your geographic area and what they pay.
Forensic Economists
A forensic economist takes the vocational expert’s findings and translates them into a lifetime dollar figure. The calculation pulls in your remaining work-life expectancy from actuarial tables, projected wage growth, expected inflation, and a discount rate that converts the entire future loss into a present-day lump sum. The discount rate is the most contested variable, and two economists working from the same facts can reach significantly different totals depending on the rate they use. In cases with significant future earnings at stake, the choice of economist and their methodology can swing the result by hundreds of thousands of dollars.
Your Duty to Mitigate
Courts expect injured people to take reasonable steps to limit their financial losses. You do not need to rush back to a job your doctor has not cleared you for, but you cannot sit at home turning down suitable work and expect to recover full lost wages for the entire period.
In practice, mitigation looks like following your treatment plan, attending medical appointments, and considering light-duty or modified work if your doctor approves it. If you cannot return to your previous job at all, a good-faith effort to find alternative employment within your medical restrictions strengthens the claim. The defendant bears the burden of proving you failed to mitigate, but if they can show you ignored a viable light-duty offer or stopped treating with no medical explanation, a court may reduce your award by the amount you could have earned. Keep records of every job application, doctor visit, and work restriction.
Two Things That Affect What You Actually Keep
Two issues catch injured people by surprise after they have already proved the claim.
The first is other benefits you received while recovering. Under the collateral source rule, most states do not let a defendant reduce your damages just because you received compensation from an independent source like your own disability policy. But many disability and workers’ compensation policies contain subrogation provisions requiring you to reimburse the insurer out of your settlement or verdict. Some states have also modified the collateral source rule to allow judges to reduce awards by benefits already paid. Clarify any subrogation obligations before you settle, because they directly affect your net recovery.
The second is taxes. If your lost income award stems from a physical injury or physical sickness, the entire amount, including the portion allocated to lost wages, is generally excluded from gross income under federal tax law.4Office of the Law Revision Counsel. 26 USC 104 – Compensation for Injuries or Sickness The IRS has confirmed the exclusion covers lost wages received as part of a personal physical injury settlement. Lost wage awards from non-physical injury claims, like employment discrimination or defamation, are taxable.5Internal Revenue Service. Tax Implications of Settlements and Judgments Self-employed individuals face an additional wrinkle: lost profit settlements from a trade or business are considered net earnings subject to self-employment tax and must be reported as business income.6Internal Revenue Service. Settlements – Taxability (Publication 4345)