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How to Calculate Your Disability Income Gap at $110K When RSU Vesting Creates an 'Enormous Income Year' — And Why Your LTD Stack Still Leaves a $12,500/Month Hole in 2026

The scenario: $110K base, $250K RSU vest, and a question nobody asks until it's too late

Say you're a software engineer at a company that IPO'd last year. Base salary: $110,000. This year, a chunk of your RSUs vested — $250,000 worth, taxed as ordinary W-2 income the moment they hit your account. Total comp for 2026: roughly $360,000. NerdWallet's piece on managing an "enormous income year" walks through the tax side of that windfall — AMT triggers on ISOs, ordinary income on NSOs, withholding traps on RSUs. But almost nobody runs the parallel question: what happens to your disability coverage in a year like this?

The uncomfortable answer: your SSDI benefit and your employer's long-term disability (LTD) policy don't care about the $250,000. Both are calculated off base salary. If you become disabled, your income replacement gap isn't small — it's whatever gap exists between the lifestyle a $360,000 household actually runs on and the $5,500/month that SSDI plus LTD combined will pay. Let's do the actual math.

Step 1: Estimate SSDI using the PIA formula

Social Security doesn't look at your RSU vest at all — earnings above the Social Security wage base (roughly $176,100 in 2025, likely near $181,000-$183,000 for 2026) never enter the calculation, no matter how high your W-2 runs. So a $250,000 RSU vest year and a $180,000 base-salary-only year look identical to SSA.

Assume this engineer has 15+ years earning at or above the wage base, blended with lower early-career years, producing an Average Indexed Monthly Earnings (AIME) of about $9,000. Using approximate 2026 bend points ($1,257 and $7,573):

  • 90% × $1,257 = $1,131.30
  • 32% × ($7,573 − $1,257) = 32% × $6,316 = $2,021.12
  • 15% × ($9,000 − $7,573) = 15% × $1,427 = $214.05

PIA (SSDI monthly benefit) ≈ $3,366

That's near the practical ceiling for SSDI in 2026 — but it's still just $3,366 against a household running on $30,000/month in gross comp. This is the same PIA mechanics we walked through in SSDI's PIA Formula at $85K, and the pattern holds: higher earnings compress your replacement ratio, they don't expand your dollar benefit proportionally, because of the 15% top bend point.

Step 2: Employer LTD — and the clause that quietly excludes your RSUs

Most group LTD policies define "covered earnings" as base salary, sometimes plus bonus, almost never equity compensation. A typical 60%-of-base policy pays:

60% × $110,000 ÷ 12 = $5,500/month gross

Then the standard SSDI offset kicks in — most group LTD contracts reduce dollar-for-dollar by any SSDI award:

$5,500 − $3,366 (SSDI) = $2,134/month from LTD

Combined SSDI + LTD stack = $5,500/month. Notice this total doesn't change whether SSDI approves you or not — the offset just shifts which check the money comes from. The number to remember is $5,500. Now compare it against two very different versions of "normal" spending.

Step 3: The gap depends entirely on which lifestyle you're replacing

Base-salary lifestyleTotal-comp lifestyle
Monthly gross target (60-70% replacement)$6,417$18,000
SSDI (PIA)$3,366$3,366
Employer LTD (net of offset)$2,134$2,134
Combined stack$5,500$5,500
Monthly gap$917$12,500
Annual gap$11,004$150,000

If this household has been banking the RSU income and living on base salary alone, the real gap is a manageable $917/month — closeable with a modest supplemental policy. If the household has scaled its mortgage, private school tuition, and lifestyle to the full $360,000 total comp, the gap is $12,500/month, or $150,000 a year, and no off-the-shelf supplemental disability policy sold through open enrollment is sized to close that.

This is exactly the kind of math where "your numbers will differ based on your specific situation" isn't a disclaimer — it's the entire finding. The same base salary and the same LTD policy produce a 13x difference in monthly gap depending on one variable: how much of the equity comp got baked into fixed spending. This is the kind of analysis Protevano runs for you — so you don't have to build the spreadsheet yourself, plugging in your actual burn rate instead of a generic replacement ratio.

Step 4: The elimination period — where actual burn rate, not target replacement, is what matters

During the elimination period (commonly 90 or 180 days), neither SSDI nor LTD pays anything. SSA also imposes a mandatory 5-month waiting period before SSDI benefits can start even after approval — and initial SSDI decisions take an average of 7-8 months, with roughly 60% of initial applications denied, pushing many claimants into an appeals process that can add 8-14 months more. We've covered this compounding delay in detail in The True Cost of Disability at $102K, and the mechanics don't change with a bigger paycheck — they just get more expensive.

For a 180-day elimination period, at an actual household burn rate of, say, $15,000/month (somewhere between the base-only and total-comp scenarios — mortgage, two cars, private school, the works):

180 days ÷ 30 × $15,000 = $90,000 needed in cash or credit before the first disability dollar arrives

That's the real number to plan against, not the replacement-ratio gap. If SSDI gets denied on the first pass and appeals push the timeline to month 14, the exposure roughly doubles.

Step 5: Bridging the gap — credit score reality check

If liquid savings don't cover the full $90,000, a 0% APR card is a legitimate short-term bridge for part of it. NerdWallet's real application data on 0% APR approvals shows most successful applicants land in the 700+ range, though some approvals happen in the high 600s on cards with shorter promo windows. A 15-21 month 0% intro period could realistically cover $20,000-$30,000 of the gap interest-free — but only if the disability claim resolves inside that window. Given that SSDI appeals routinely run 12+ months, treat a 0% card as a partial bridge, not a plan. Interest resumes at 20%+ APR the day the promo ends, whether or not your claim has been decided.

Step 6: Two smaller levers that actually move the number

Two of this week's headlines are quietly relevant here. Mortgage rates dipped slightly on July 6 following a soft June jobs report — worth checking, because a refinance from 7.1% to 6.6% on a $500,000 mortgage cuts roughly $170/month off the fixed burn rate. Over a 180-day elimination period, that's about $1,020 of the $90,000 hole closed before you've done anything else. It's not a fix, but it's real money, and it's the kind of lever people overlook while focused on the big scary total.

The other lever is behavioral: elimination-period budgeting is a good moment to redirect discretionary spend — including chasing this summer's Delta Amex travel offers — toward the cash reserve instead. Rewards points don't cover a mortgage payment during month four of an unpaid elimination period; a fully funded reserve does.

Step 7: The tax complication nobody budgets for

Here's the part that surprises high earners specifically. Employer-paid LTD premiums (the norm in group plans) make the LTD benefit itself taxable income. SSDI becomes partially taxable once provisional income crosses federal thresholds — easy to trip if a spouse still works or investment income continues during the claim. And if the disability event happens in the same tax year as an RSU vest, ISO exercise, or NSO recognition, you can end up with a genuinely complicated return despite a fraction of your prior take-home cash actually arriving. NerdWallet's guide to small-business tax services frames the CPA-vs-enrolled-agent-vs-DIY-software decision for complex filings — the same logic applies here: once equity comp and disability benefit coordination collide in one tax year, a generalist software product usually isn't enough.

Run your own numbers

The formula holds regardless of your salary: SSDI from your actual earnings history, LTD from your actual base-salary policy terms, an elimination-period burn rate from your actual fixed expenses — not a rule-of-thumb replacement ratio. If you want the full walkthrough with your own AIME, offset terms, and burn rate, the 4-source stack calculation at $77K shows the step-by-step version, and you can model your specific base salary, equity comp, and elimination period at Protevano to see exactly where your stack falls short — before an "enormous income year" turns into an enormous income gap.

Sources

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