How Much House Can You Afford on Equity Heavy Compensation?

The Disconnect Between What You Earn and What Lenders See

You earn $500,000 in total compensation. Your offer letter says so. Your W-2 confirms it. But when you sit down with a mortgage lender, they see a different number, sometimes dramatically different.

Mortgage qualification is built on a single principle: stable, documentable income. Lenders want to know that you can make the same payment every month for the next 30 years. Base salary fits that model perfectly. Equity compensation does not. RSUs vest on a schedule tied to continued employment and fluctuate with the stock price. Bonuses vary year to year. Stock options may never be worth anything.

This mismatch means tech employees routinely qualify for less home than their total compensation would suggest. Understanding exactly how lenders evaluate your income is the first step to buying strategically rather than reactively.

How Lenders Treat Each Income Type

Not all dollars on your W-2 are created equal in a lender's eyes. Here is how each component of tech compensation is typically evaluated:

Base salary is counted at 100%. This is the foundation of your qualifying income. A $200,000 base means the lender counts $200,000, no questions asked, no discounting.

Cash bonuses are averaged over two years. If you received a $60,000 bonus last year and a $40,000 bonus the year before, the lender counts $50,000. You will need two years of bonus history documented on tax returns or pay stubs. A single year of bonus income is often excluded entirely.

RSU income is where things get complicated. Some lenders count it; many discount it or exclude it altogether. When it is counted, lenders typically average your RSU income over 24 months of tax returns and may apply a further haircut of 10-25% to account for stock price volatility. If you recently joined a company or recently started receiving RSUs, expect the lender to ignore this income entirely during your first purchase.

Stock option income is rarely counted unless you have a documented pattern of exercising and selling over at least two years. Unrealized gains in unexercised options carry zero weight.

ESPP income is generally not counted as qualifying income, even if you participate every period and sell immediately. Lenders view it as too irregular and discretionary.

The Two Year History Requirement

The most important rule in mortgage qualification for equity compensation: lenders want 24 months of consistent income history on your tax returns. This is not optional, and it is not negotiable with most conventional lenders.

If you joined your company 14 months ago, your first full year of RSU income will not appear on a filed tax return until the following April. That means you may need to wait until you have two complete calendar years of vesting history before a lender will count any of your equity income.

This creates a painful timing gap. You might be earning $400,000+ in total compensation but qualify for a mortgage based on $200,000 in base salary alone because your equity history is too short. New hires, people who recently changed companies, and employees who received a significant equity refresh that changed their income profile all face this constraint.

Planning implication: if you know you want to buy a home in the next two to three years, the clock on building documentable equity income history starts now. Every RSU vest, every option exercise, every bonus payment needs to appear on a filed tax return.

A Concrete Qualification Scenario

Consider a senior engineer with the following compensation:

• Base salary: $200,000
• Annual RSU vesting: $150,000 (with 2 full years of history)
• Annual bonus: $50,000

Here is what the lender actually counts:

• Base salary: $200,000 (full amount)
• RSU income: $125,000 (averaged and discounted ~17%)
• Bonus: $40,000 (two year average, slightly below current year)
• Total qualifying income: $365,000

At a 43% debt to income ratio (the upper limit for qualified mortgages), the maximum allowable monthly housing payment is approximately $13,000. At a 6.5% interest rate on a 30 year fixed mortgage, this supports a loan of roughly $2.05 million. With a 20% down payment, that translates to a purchase price of approximately $2.55 million.

But the question is not what you can qualify for. It is what you should actually buy.

What You Can Afford vs. What You Should Spend

Qualifying for a $2.55 million home does not mean buying one. The lender's 43% DTI ratio is a ceiling, not a target. Here is how to think about it more conservatively:

The Base Salary Rule

Apply the traditional 28% housing cost rule to your base salary only, treating all equity income as unreliable. On a $200,000 base, 28% means a maximum monthly housing payment of approximately $4,667. That supports a mortgage of roughly $735,000, a dramatically different number than the $2.05 million qualification amount.

The right answer for most tech employees is somewhere between these two extremes. A reasonable framework: apply the 28% rule to base salary plus 50% of your trailing equity income. In our scenario, that means 28% of $275,000 ($200K base + $75K, which is half of $150K RSU income) = $6,417/month, supporting a mortgage of approximately $1.01 million.

Factor In RSU Volatility

Your RSUs are denominated in shares, not dollars. If your stock drops 40% (which has happened to every major tech company at least once in the last decade), your $150,000 in annual RSU income becomes $90,000. Can you still make the mortgage payment comfortably? If the answer requires cutting into savings or reducing retirement contributions, the house is too expensive.

The Layoff Scenario

Tech layoffs affect senior engineers earning $400,000+ in total compensation. If you lose your job, your unvested RSUs disappear immediately and your next role may take 3 to 6 months to secure. Your mortgage payment continues regardless. Build 12 months of housing costs in liquid reserves before buying, not the standard 3 to 6 months that most advisors recommend.

Strategies to Strengthen Your Mortgage Application

Build a Paper Trail Early

Start selling RSUs systematically 24+ months before you plan to apply for a mortgage. Consistent quarterly sales that appear on your tax returns as ordinary income create the documentation lenders require. Holding all your RSUs and then trying to count them as income will not work.

Find a Lender That Understands Tech Compensation

Standard retail banks often lack underwriting guidelines for equity compensation. Seek out lenders that specialize in working with tech employees and understand how to document RSU income, stock option exercises, and variable bonus structures. These lenders may have specific programs for borrowers with substantial equity compensation and nontraditional income profiles.

Use a Larger Down Payment to Reduce Loan Size

If your equity income is difficult to document, reduce the mortgage amount instead. Selling $200,000 in vested RSUs for a larger down payment may be more effective than trying to convince an underwriter to count that income for qualification purposes. A 30% or 40% down payment on a lower purchase price may get you into the same home with less qualification friction.

Consider Portfolio Lending

For jumbo loans above conforming limits, portfolio lenders (who hold the loan on their own balance sheet rather than selling it to Fannie Mae or Freddie Mac) often have more flexible underwriting criteria. They may count RSU income more generously or consider total assets as a compensating factor. The tradeoff: portfolio loans typically carry slightly higher interest rates.

The Down Payment Question: Sell RSUs or Keep Shares?

This is one of the most consequential decisions in the home buying process for tech employees. Two scenarios:

Scenario A: Sell $400,000 in RSUs for a 20% down payment on a $2 million home. You eliminate PMI, reduce your monthly payment, and remove $400,000 of single stock concentration risk. The cost: you give up potential future appreciation on those shares and realize a large taxable event in the sale year.

Scenario B: Put 10% down ($200,000), keep the remaining RSUs invested. You retain $200,000 in stock exposure, but you pay PMI (approximately $400 to $800/month on a $1.8 million loan) and carry a larger mortgage. Your monthly cash flow is tighter, and you remain more concentrated in your employer's stock.

The math usually favors selling. PMI costs, the higher interest expense on a larger loan, and the concentration risk of holding employer stock generally outweigh the potential upside of keeping the shares. Additionally, the guaranteed return from eliminating PMI and reducing interest costs is more reliable than the uncertain return on any single stock.

The exception: if your company stock has a very low cost basis and selling would trigger a six figure tax bill, it may be worth running a detailed analysis on the after tax cost of selling versus the ongoing cost of a larger mortgage.

Common Mistakes to Avoid

Buying at maximum qualification. Lenders will approve you for the largest loan your income supports. That number has nothing to do with what is financially prudent. Leave a significant margin between what you qualify for and what you buy.

Ignoring property tax and insurance in HCOL areas. A $2 million home in California carries approximately $20,000 to $25,000 in annual property taxes. Insurance, HOA fees, and maintenance can add another $10,000 to $20,000. These costs are not covered by your mortgage payment and can add $2,500 to $3,750 per month to your housing expenses.

Exercising stock options to create income history without planning for taxes. If you exercise ISOs or NSOs to build mortgage qualifying income, you may trigger a substantial tax liability (including AMT for ISOs). The tax cost of creating that income history can exceed $50,000 to $100,000 depending on the spread and number of shares exercised. Model the tax impact before executing this strategy.

Assuming current RSU values will continue. Your RSU grant is denominated in shares. The dollar value you see today is a function of today's stock price. If you budget for housing based on $150,000 per year in RSU income and the stock drops 30%, your actual income drops to $105,000. Build your housing budget around a conservative estimate of equity income, not the current peak.

Rushing the timeline. Waiting an additional 12 to 18 months to build income documentation, accumulate a larger down payment, and establish a stronger financial cushion will almost always result in better mortgage terms and a more sustainable housing decision. The cost of patience is far lower than the cost of being overextended.

The Bottom Line

Buying a home on equity heavy compensation requires planning that starts years before you submit a mortgage application. Document your income early, be conservative in your budgeting, and treat your base salary as the foundation of what you can sustain. Your RSUs and bonuses provide optionality and acceleration, but they should not be the load bearing structure of your largest financial commitment.