TTD vs PPD in Workers' Comp: What's the Difference?
When you file a workers' comp claim, you'll hear two acronyms almost immediately: TTD and PPD. They sound similar. They're calculated differently. And confusing them can lead to a very wrong estimate of what your case is worth.
Here's the plain-English breakdown.
TTD: Temporary Total Disability
TTD benefits are for when you're completely unable to work because of your injury. Temporary means the situation is expected to change — you're recovering, and at some point you'll either return to work or your condition will stabilize.
Total means you can't work at all during this period. If your doctor puts you on light duty and your employer offers you a modified position, your TTD benefits may stop or convert to a different benefit type.
TTD is calculated as a percentage of your Average Weekly Wage — typically 66.67% — up to your state's maximum. It's paid weekly, like a paycheck, while you're out of work.
TTD ends when one of three things happens:
- You return to work
- You reach Maximum Medical Improvement (MMI) — your doctor says you've healed as much as you're going to
- You hit your state's maximum benefit period
California caps TTD at 104 weeks for most injuries. Other states have different rules, and some serious injuries have extended caps.
PPD: Permanent Partial Disability
PPD benefits are for when your injury leaves you with a lasting impairment — something that doesn't fully heal. Permanent means it's not expected to resolve. Partial means you still have some function, just not full function.
PPD is evaluated after you reach MMI. Your doctor assigns an impairment rating — either as a percentage of a specific body part (in scheduled loss states) or as a Whole Person Impairment percentage (in states like California).
That rating then drives a separate calculation, using your state's PPD formula, to arrive at a benefit amount.
PPD is often where the bigger money is in a serious workers' comp case. TTD covers your time out of work. PPD compensates you for the permanent change to your body and, in some states, your reduced earning capacity going forward.
The Transition: From TTD to PPD
Most serious claims move through both phases. TTD covers the recovery period. The switch to PPD happens at a defined point: Maximum Medical Improvement (MMI).
MMI doesn't mean you've fully recovered — it means your condition has stabilized as much as it's expected to. Your treating physician makes this determination. Once MMI is declared, TTD payments typically stop and the evaluation of any permanent impairment begins.
This is often when the insurance carrier requests an Independent Medical Examination (IME) — an evaluation by a physician they select. The IME doctor reviews your medical records, examines you, and assigns a permanent impairment rating. That rating then feeds directly into the PPD formula.
IME ratings and treating physician ratings don't always agree. When they diverge significantly — which happens regularly — the dispute over which rating applies becomes a central issue in the claim. This disagreement is one of the most common reasons workers' comp cases go to hearings, and one of the strongest arguments for having an attorney involved before the IME occurs.
Can You Get Both?
Yes — and many injured workers do.
TTD runs while you're recovering and unable to work. Once you reach MMI and your doctor assigns a permanent impairment rating, you transition to PPD. In practice, most settlements combine both: you're compensated for the wages you lost during recovery (TTD) plus the permanent impairment (PPD) in a single lump-sum agreement.
Our calculator handles both separately and combined. Select "Both" if you want to see the full picture.
Which One Applies to Your Situation?
- Still recovering and out of work → TTD
- Reached MMI, have a permanent impairment rating → PPD
- Both happened in your case → Both
If you're not sure whether you've reached MMI, ask your treating physician directly. "Have I reached Maximum Medical Improvement?" is a question you're entitled to ask, and the answer determines what benefits you're eligible for next.
Common Questions
What happens if I return to work part-time while on TTD?
Returning to part-time or modified-duty work typically ends full TTD and may convert your benefit to Temporary Partial Disability (TPD) — a reduced payment that accounts for the wages you're now earning. The exact rules vary by state, but the principle is consistent: you generally cannot collect full TTD while drawing any wages from work. Report any return to work immediately to your employer and the insurer. Failing to do so can create an overpayment situation that damages your credibility for the rest of the claim.
Can I collect TTD and PPD at the same time?
Not simultaneously — they're sequential. TTD ends at MMI; PPD begins after your permanent impairment is rated. When a case settles as a lump sum, outstanding TTD and the full PPD value are typically folded into a single payment. That's why lump-sum settlement totals often look larger than either benefit would be on its own — they're covering two separate things at once.