Bucket 01
Maintenance: 1% of value annually
$300K home = $3K/yr = $250/mo budget. Some years you spend nothing; some years the roof goes. Average it monthly into reserves. Skipping this is how new homeowners end up financing $15K boilers at 24% APR.
Hidden Costs · what nobody tells you
PITI is the floor.
Not the ceiling.
When the calculator shows $1,800/mo, real ownership costs ~$2,300-2,500/mo. Maintenance, utilities, HOA, escalating insurance + tax — these are the ongoing costs that surprise new homeowners and stretch budgets.
· The five hidden buckets
Five line items.
Real monthly money.
Bucket 02
Utilities
Gas, electric, water, sewer, trash, internet. Often $200-450/mo depending on home size + climate. If you've been renting an apartment, expect a 50-100% jump for a single-family home.
Bucket 03
HOA / condo fees
Single-family homes: usually $0. HOA neighborhoods: $50-300/mo. Condos: $200-700/mo (covers exterior + sometimes utilities). Required, not optional. Increases over time.
Bucket 04
Insurance + tax escalation
Property tax goes up annually as the assessor reassesses. Insurance premiums went up ~20-40% nationally in the last 3 years. Even with escrow, the monthly slowly creeps up.
Bucket 05
PMI (if applicable)
On loans <80% LTV, mortgage insurance is added monthly. ~$100-200/mo on a $300K loan. Falls off automatically at 78% LTV on conventional. FHA carries it for life of loan unless you put 10%+ down.
· Watch-outs
Four traps
in the 'just the mortgage' framing.
Pitfall 01
Quoting only P&I.
Many calculators show $1,500/mo P&I and call that 'your mortgage payment.' Real PITI adds tax + insurance + (sometimes) PMI. Always run full PITI before deciding.
Pitfall 02
Forgetting capex.
Roof every 25 years. HVAC every 15. Water heater every 10. Driveway every 15. Average these monthly. The big-ticket failures will hit during your ownership window.
Pitfall 03
Skipping reserves at close.
Closing with $0 left in the bank = a small problem becomes a big problem. Always close with at least 3 months of PITI in reserve.
Pitfall 04
Underestimating utility jump.
If you're moving from a 700 sq ft apartment to a 1,800 sq ft house, your utilities can 2-3x. Get the previous owner's utility bills before close. Sellers are required to disclose in many states.
Affordability is total cost.
Not just the mortgage.
Five minutes. We model your real PITI + maintenance reserves + utilities and show you the honest monthly number.