Refinancing Your Mortgage During Equity-Stock Volatility

A senior IC originated their $1.6M mortgage in 2021 at 3.5% when their tech company’s stock was at $400. They lived on a $200K base and $300K in RSU vests. In 2023 the stock dropped to $150. Their RSU income, same share count, is now $112K annually. They want to refinance in 2026 when rates are elevated but they’re considering a cash-out refi.

The re-qualification uses current income. Current RSU income is 63% lower than at origination. DTI math that worked in 2021 may not work in 2026. And if the stock drops further during the 45-60 day refi process, the loan can fall apart at funding.

This article covers the specific pitfalls of refinancing when your RSU-heavy income has moved meaningfully.

Re-qualification is a fresh underwrite

Refinancing isn’t an amendment to the existing loan. It’s a new loan that pays off the old one. The underwriter treats you as a new borrower:

• New credit pull
• New income verification
• New DTI calculation
• New appraisal
• Fresh reserve requirements

Any changes since origination, job change, income decline, liability increase, appraisal decline, can kill the refinance even though the original loan was approved.

The 2-year RSU averaging trap

The same 2-year averaging rule that applied to the original loan applies to the refinance. If 2024 RSU income was $180K and 2025 was $110K, the average is $145K, which may not support the same loan size.

Some lenders use the most recent year as a trim factor:

• If most recent year is lower than previous year, use most recent year only
• If most recent year is higher, use the 2-year average

Under this rule, our borrower’s qualifying RSU income is $110K, not the 2021-era $300K. DTI tolerance is meaningfully tighter.

Stock price at appraisal and pledged-asset refis

For pledged-asset refinances, the pledged collateral is revalued at refi. If you pledged $800K of stock at $400/share in 2021 and the stock is at $150/share in 2026, the pledge value is now $300K, 37.5% of original. The refi may require additional collateral or a larger cash paydown.

For borrowers with concentrated tech stock as pledge, this revaluation can be brutal during a drawdown. Some borrowers who were comfortable with pledged-asset structures in 2021 found themselves needing to post additional collateral in 2022-23.

Reserve requirements on refi

Reserves are calculated on current asset values and current PITI. If your stock portfolio dropped 40%, your reserve-capable asset base dropped 40%. If your PITI stayed the same, your reserve ratio tightened.

Lenders typically require:

• Standard refi: 6 months of new PITI in reserves
• Cash-out refi: 9-12 months
• Jumbo refi: 12 months

A borrower who barely met reserve requirements at origination might not meet them now after a stock drop.

The appraisal side

Property values fluctuate too. Tech-heavy markets (Bay Area, Seattle, Austin) have shown 15-25% swings in the 2020-2025 period. An appraisal that comes in below expected value can push LTV above the refi program’s max and kill the deal.

Appraisal risk can be mitigated by:

• Avoiding cash-out if LTV is near the max
• Requesting a “desk appraisal” or exterior-only appraisal for familiar properties
• Timing refinance to market conditions

Rate-and-term vs cash-out

Two types of refinances:

Rate-and-term refi. Same loan balance, different rate or term. Simpler, faster, lower cost. Usually qualifies at 80% LTV or similar. No cash extraction.

Cash-out refi. New loan is larger than old loan; borrower receives cash difference. Capped at 80% LTV typically. Higher rate premium (25-50 bps). Harder re-qualification because larger loan = higher DTI.

For a borrower in a period of declining RSU income, rate-and-term refi is easier. Cash-out stresses the DTI math and may not qualify.

Cost analysis

Refinancing costs typically 2-5% of loan value: lender fees, title, appraisal, taxes, recording. For a $1.6M loan, $32K-$80K in closing costs.

Break-even analysis:

• Rate drop of 100bps on $1.6M = $16K/year in interest savings
• Breakeven on $40K of closing costs: 2.5 years

If you’re planning to sell within 2-3 years, refinancing rarely pays off. If the stay is 5+ years, a 100bp rate drop usually works.

Timing the rate environment

Senior ICs often originate mortgages in one rate environment and face refinancing in another. 2021 originators at 3.0-3.5% have no incentive to refi in 2025-26 at 7%. 2023 originators at 7.5% have incentive to refi if rates drop to 6%.

Trying to time refi windows precisely is a losing game. Better approach:

• Refinance when the math works regardless of further rate movements
• Don’t lock in a refi commitment if rates are in active decline
• Watch the 45-60 day rate lock window carefully during volatility

The cash-out-to-paydown sequence

Some borrowers use cash-out refi to unlock home equity for other purposes. For tech employees with concentrated stock:

• Cash-out refi at 7% to pay down concentrated stock position’s tax bill (ISO AMT)
• Cash-out refi to fund a DAF contribution for charitable deduction timing
• Cash-out refi to fund exchange-fund contribution

The rate differential (7% refi cost vs ~0% cost of selling stock) usually makes refi the more expensive path. It only works when the alternative (selling stock) triggers a higher-cost tax bill.

Interaction with concentration reduction

If you’re de-concentrating over 3-5 years and refinance in the middle of that process:

• Your 2-year averaged RSU income drops year over year
• Qualifying DTI tightens each year
• Reserve asset base shifts from stock to cash or diversified

Plan the refinance timing around the de-concentration milestone. Ideally refinance:

• Early in the process when stock values are high
• Before meaningful income decline reflects in W-2s
• With enough asset reserves to buffer future volatility

Frequently asked

Can I refinance with less income than at origination? Yes, if the new loan is smaller or the terms still fit DTI. Re-qualification is based on the new loan, not comparing to original. A rate-and-term refi with the same balance just needs to pass current DTI.

What if the appraisal comes in below expectations? LTV rises, which may push above program max. Options: add cash to closing to reduce loan, walk away and eat appraisal fee, dispute appraisal (rarely successful).

Does §6501 statute matter for refi documentation? Lenders typically want 2 years of tax returns regardless of IRS statute. For the IRS side, keep return documentation for at least 7 years.

How does trailing-nexus affect refi? If you moved from California but still have California trailing-nexus RSU tax liability, your true net income is lower than W-2 alone suggests. Lenders don’t track this but it affects actual debt-service capacity.

What’s the interaction with IRMAA? Cash-out refi itself doesn’t trigger AGI. But if you refi to fund a stock purchase and the stock throws off dividends, those add to MAGI. For retirees 63+ planning cash-out, model the AGI impact on Medicare premiums.