How much house can you really afford when compensation is variable?

If your income includes bonuses, RSUs, overtime, or consulting revenue, the standard mortgage rule of thumb can get dangerous fast.

The problem is not that variable compensation is fake. The problem is that it is less reliable, less smooth, and often taxed less intuitively than base salary.

The real affordability question

Do not ask:

“How much mortgage will the bank approve?”

Ask:

“What housing cost can this household carry if variable compensation is weak for a year or two?”

That is the number that matters.

Why technical professionals get exposed here

You may be earning a lot on paper while still carrying meaningful uncertainty:

RSUs depend on vesting and market value
bonuses depend on employer performance
consulting income can be lumpy
overtime and field allowances may not be permanent

That means an “average” year can be a bad anchor for a fixed monthly housing decision.

A more durable approach

For many households, the safest frame is:

use base salary as the core affordability anchor
treat variable compensation as a buffer, not a requirement
make sure the household can survive a weak-comp year without panic

If variable compensation does help, let it help with:

faster down payment building
extra mortgage prepayments
renovations
non-essential acceleration of goals

That is different from needing it to make the monthly payment work.

What else belongs in the model

childcare and family plans
future mat or pat leave
commuting changes
home-maintenance reserves
concentration risk if a lot of wealth is tied to one employer already

Checklist

Stress-test the house payment using base salary, not best-case total comp.
Treat bonuses and RSUs as variable, even if they have been consistent.
Include maintenance, taxes, and future family costs in the model.
Avoid a mortgage that requires everything to go right.
Use variable comp to accelerate goals, not to justify fragility.