HouseDeltas

the honest math of Canadian home buying
Educational estimates, not financial advice. Every number here is computed live from your inputs — and every constant links to its CRA / CMHC / OSFI / provincial source.

HouseDeltas — scenario summary

Price $900,000 · Down payment 20% · first-time buyer · Other closing costs $5,000

Amortization 25 yrs · Segment 1 rate 5.24% (until payoff)

Rented portion 50% at $2,200/mo, 8% vacancy

Property tax 0.767% · Maintenance 1% · Insurance 0.25% · Utilities / mo $400/mo

Home appreciation / yr 3%/yr · Rent growth / yr 2.5%/yr · Investment return / yr 5%/yr · Selling costs 5.800000000000001%

Educational estimates, not financial advice. Verify numbers with your lender, accountant, and lawyer before acting.

What does it really cost each month?

Unrecoverable dollars only — principal is savings you keep, so we count it separately.

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True monthly cost — buy + suite, year 1
$2,758
$942/mo less than renting

All-in you’ll write cheques for $3,962/mo — but $1,205 of that is principal you keep.

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Three ways to live in this house

$2,000$4,000$6,000$8,000$3,082$1,913$1,205Buy it alonetrue cost $4,995/mo$3,450Rent insteadtrue cost $3,450/mo$2,758$2,237$1,205Buy + suitetrue cost $2,758/mo
gone (sunk) taxes & upkeep (sunk) principal you keep cost the suite absorbed
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Where the cheque goes — gross monthly costs

$6K/mo gross
  • Mortgage interest$3,082
  • Property tax$575
  • Maintenance$750
  • Insurance$188
  • Utilities$400
  • Principal (kept)$1,205

Cheques total $6,199/mo before the suite. The suite hands back $2,237 net, and $1,205 is principal you keep — which is how the true cost lands at $2,758/mo.

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Is the suite pulling its weight?

73%of interest

Suite income covers 73% of year-one mortgage interest ($2,237 of $3,082/mo).

Saves vs buying alone
$2,237/mo
Saves vs renting
$692/mo
Cash to close
$205,475