How to Calculate Your Disability Income Gap at $67,500: SSDI PIA Math, LTD Offset, and the $2,250/Month Hole Plus a $16,875 Wait
Picture a 38-year-old earning $67,500 a year, which is $5,625 a month gross. They have a mortgage, a decent job, and an HR portal that says "employer-paid long-term disability: 60% of pay." That sounds like most of the paycheck is covered.
Then a back injury or a cancer diagnosis keeps them off work for good. When I ran the numbers, the actual result was $3,375 a month at best, after a 90-day stretch with nothing coming in. That leaves a $2,250/month gap, and a $16,875 cash hole before the first benefit check.
This post walks through that calculation one step at a time, so you can redo it with your own salary. Every dollar figure below comes from a worked example I constructed and labeled, or from the articles cited. The example is illustrative, and your numbers will differ based on your specific situation.
Why a Gap Check Works Like a Home Insurance Check
NerdWallet's piece Is Your Home Insurance Enough to Weather a Disaster? How to Check makes a simple point. Find the gaps in your coverage before the disaster, not after. Disability coverage has the same parts, just under different names:
| Home insurance concept | Disability equivalent | Where the gap hides |
|---|---|---|
| Deductible | Elimination period | 90 days of zero income before LTD pays |
| Coverage limit | Monthly benefit cap | 60% of base pay, capped at a fixed dollar amount |
| Exclusions | Pre-existing condition and work-related limits | Fine print about what triggers a claim |
| Replacement cost vs. actual cash value | Covered earnings definition | Bonus, commission, and overtime often excluded |
| "Named perils" | Own-occupation vs. any-occupation | The definition can switch after 24 months (see the own-occ to any-occ time bomb) |
Most people read the headline percentage, "60%," and never check the deductible or the exclusions. The steps below check all of them.
Step 1: Estimate Your SSDI Benefit From the PIA Formula
SSDI is calculated from your Primary Insurance Amount (PIA), which comes from your Average Indexed Monthly Earnings (AIME). The formula has three tiers. As I understand the 2026 bend points, they are $1,286 and $7,749. Confirm them at ssa.gov before relying on them.
- 90% of AIME up to $1,286
- 32% of AIME between $1,286 and $7,749
- 15% of AIME above $7,749
Assumption for this example: our 38-year-old has an AIME of $4,900. It sits below the current $5,625 salary because earlier career years pay less, and disability benefits use fewer earnings years for younger workers. Your AIME is on your my Social Security statement.
- 90% × $1,286 = $1,157.40
- 32% × ($4,900 − $1,286) = 32% × $3,614 = $1,156.48
- PIA = $2,313.88, which rounds down to about $2,314/month
That is 41% of the $5,625 paycheck. For the full walkthrough, see SSDI Benefits Explained: How the PIA Formula Determines Your Monthly Check.
You can run the PIA math on your earnings record at Protevano. Doing it by hand means indexing 35 years of wages.
Step 2: Apply the Employer LTD Offset
This is where people get tripped up. Most group LTD policies promise "60% of pay" and then subtract what SSDI pays. Stacking the two doesn't add up to more than 60%.
- LTD target: 60% × $5,625 = $3,375
- Minus SSDI offset: $3,375 − $2,314 = $1,061 paid by the insurer
- Total from both sources: $3,375 (the same as LTD alone)
SSDI didn't add a dollar to household income. It just moved who pays. The insurer gave itself a $2,314 discount, and you got nothing extra.
The offset rules get stranger when other income sources are involved. For a $84K example with a lot of moving parts, see The Hidden Offset Rules That Cut a $84K Disability Stack to $4,200/Month.
Step 3: Calculate the Gap
- Pre-disability income: $5,625
- Total disability income: $3,375
- Monthly gap: $2,250 (40% of your pay)
Taxes make it worse in some cases. If your employer paid the LTD premium, benefits are generally taxable. Some SSDI can be taxable too, depending on your other income. These figures are all gross, so your take-home gap may differ.
Step 4: Model the Elimination Period
The gap isn't $2,250 from day one. It starts at $5,625 a month because you get no LTD during the elimination period. This example assumes no short-term disability or paid sick leave, which would shrink the hole.
Here is the cumulative shortfall on a 90-day elimination period:
| Time horizon | Calculation | Cumulative shortfall |
|---|---|---|
| 3 months | 3 × $5,625 | $16,875 |
| 12 months | $16,875 + 9 × $2,250 | $37,125 |
| 24 months | $16,875 + 21 × $2,250 | $64,125 |
| 60 months | $16,875 + 57 × $2,250 | $145,125 |
The first 90 days cost $16,875, and after that the gap keeps growing by $2,250 every month. Over five years that is $145,125 in lost income, even though the LTD policy is paying on schedule.
Now compare how the elimination period length changes the 24-month total:
| Elimination period | Uncovered pay | Months of gap after | 24-month shortfall |
|---|---|---|---|
| 60 days | $11,250 | 22 × $2,250 = $49,500 | $60,750 |
| 90 days | $16,875 | 21 × $2,250 = $47,250 | $64,125 |
| 180 days | $33,750 | 18 × $2,250 = $40,500 | $74,250 |
Going from 90 to 180 days adds $10,125 to your exposure. Going from 60 to 90 adds only $3,375. Shorter waiting periods usually cost more in premium, so a lower deductible isn't automatically better. It depends on how much cash you hold. For the reserve-building side of this, see Elimination Period Cash Flow: Surviving 90-180 Days With Zero Income.
Step 5: Test the Percentage Your Policy Actually Pays
A 50%, 60%, or 66⅔% policy changes the picture, all at a 90-day elimination period:
| LTD replacement % | Monthly benefit | Monthly gap | 24-month shortfall |
|---|---|---|---|
| 50% | $2,812.50 | $2,812.50 | $75,938 |
| 60% | $3,375 | $2,250 | $64,125 |
| 66⅔% | $3,750 | $1,875 | $56,250 |
Each 10 percentage points of replacement is worth about $562 a month, or roughly $11,800 over 24 months in this example. That is why reading the actual percentage in your summary plan description matters more than reading the benefits brochure.
This is the kind of side-by-side Protevano runs for you, so you don't have to rebuild the spreadsheet every time your salary or policy changes.
The Same Disability, Two Different Answers: Off the Job vs. Work Injury
Workers' compensation changes the math. Suppose the same person is injured at work instead. This uses a simplified setup where comp pays 66⅔% of pay, and the combined SSDI and comp total is capped at 80% of average current earnings. State rules vary, and some states use a "reverse offset" that reduces comp instead of SSDI.
- Workers' comp: 66⅔% × $5,625 = $3,750
- SSDI: $2,314
- Combined: $6,064, which exceeds the 80% cap of $4,500
- SSDI is reduced by $1,564, leaving $750
- LTD: $3,375 target minus $3,750 comp means the insurer pays $0
| Scenario | Total monthly income | Monthly gap | 24-month gap (approx.) |
|---|---|---|---|
| Off-the-job illness or injury | $3,375 | $2,250 | $64,125 |
| Work-related injury | $4,500 | $1,125 | ~$27,000 |
The work-injury path leaves a smaller gap, but its 24-month figure ignores any short waiting period on comp. The point is that the cause of your disability changes which sources pay. That's why one national "average gap" can't tell you yours. If you're weighing the workers' comp and SSDI interaction, The SSDI Offset Trap covers how the reduction works.
State programs add another variable, since a handful of states have mandatory disability insurance and the benefits vary widely. 5 States With Mandatory Disability Insurance shows how different they can be. If you live in a state with no program, that source is zero in your stack.
What the August 2026 BLS Numbers Add to This
The Bureau of Labor Statistics' Major Economic Indicators page lists the following for August 2026:
- CPI: +0.4% (monthly)
- Unemployment rate: 4.1%
- Payroll employment: +162,000 (preliminary)
- Average hourly earnings: +$0.10 (preliminary)
Three things follow from these for a disability gap calculation.
1. LTD benefits are usually fixed dollar amounts. Your $3,375 doesn't rise with prices. As a stress test only (this is not a forecast), imagine 0.4% monthly inflation held for a year. That is 1.004¹² ≈ 1.049. Your $3,375 then buys what $3,217 buys today, about $158 less per month in real terms.
2. SSDI's cost-of-living increases may not reach you. SSDI gets a COLA, but many policies offset LTD by the current SSDI amount. Say SSDI rises 3% (a hypothetical). That is +$69, and the LTD insurer cuts your check by the same $69. Your total stays at $3,375. Check whether your policy offsets this way.
3. Wage growth doesn't help you save your way out. A $0.10 hourly raise on a full-time schedule is roughly $208 a year (0.10 × 2,080 hours), pre-tax. That won't quickly fund a $16,875 reserve.
Also note that group LTD is usually tied to your job. Even with unemployment at 4.1%, if you leave or lose the job, the coverage typically ends unless you have a conversion or portability option.
Where Home Buying and Side Income Collide With Your Reserve
Two other NerdWallet pieces bear on this decision even though they aren't about disability.
Homebuying assistance. In Locked Out: Should You Take 'Free Money' to Buy a Home?, the advice is that assistance can lower your upfront costs but you should weigh the trade-offs first. In disability terms, ask what the program does to your monthly obligations and your reserves. In our example, a housing cost of $1,900/month (an assumed figure) leaves $1,475 for everything else on a $3,375 disability income. Check whether any program you take changes that number, and whether the cash you keep after closing covers the $16,875 elimination period. Program terms vary, so read yours.
Side income. NerdWallet's Quiz: What's the Best Way to Make Money? is about finding a side hustle. A hypothetical $500/month of side income directed to savings would build a $16,875 reserve in about 34 months (16,875 ÷ 500 = 33.75). But don't count on side income during a disability. LTD policies can offset earnings, and SSDI has a substantial gainful activity limit, so working can cost you benefits. Check both rules before you rely on it.
Stacking. NerdWallet's How I Earned 1 Million Points With My Family Cruise Booking shows how booking through an airline portal can stack miles, card rewards, and possibly elite status. With rewards, stacking adds. With disability benefits, stacking subtracts through offsets. In our example, SSDI plus LTD is $3,375, the same as LTD alone. The three sources only add up if the offset rules let them.
Your Variables, Your Answer
Here is the checklist to redo this for yourself:
- Monthly gross pay, including what your LTD counts as "covered earnings"
- Your SSDI estimate from your Social Security statement, or your AIME run through the PIA formula
- LTD percentage, cap, and offset language in your summary plan description
- Elimination period, and any short-term disability or sick leave that fills it
- State disability program, if your state has one
- Cause of disability, since work-related and off-the-job claims stack differently
- Cash reserve on hand, compared with your elimination period cost
For a $67,500 earner with a 60% policy and a 90-day wait, the gap is $2,250/month. But it could be $1,875 or $2,812 with a different policy percentage, and $1,125 if the injury is work-related. Once you see how many combinations there are, a single "average" number can't tell you which one you're in.
If you want to compare your gap against the supplemental coverage question, Should I Buy Supplemental Disability Insurance at $65K? uses a similar framework.
Run Your Own Numbers
None of this requires guessing. You need your salary, your Social Security earnings record, your LTD plan document, and about 20 minutes. If you'd rather not build the spreadsheet, you can model your PIA estimate, LTD offset, elimination period, and workers' comp or state disability interaction at Protevano. Whether the answer is "I'm fine" or "I have a $2,250 problem," you'll be working from your real figures and not a rule of thumb.
Sources
- Is Your Home Insurance Enough to Weather a Disaster? How to Check — NerdWallet
- Major Economic Indicators Latest Numbers — Bureau of Labor Statistics
- How I Earned 1 Million Points With My Family Cruise Booking — NerdWallet
- Locked Out: Should You Take ‘Free Money’ to Buy a Home? — NerdWallet
- Quiz: What’s the Best Way to Make Money? — NerdWallet