$300,000 Mortgage at 5.5%

See exactly what you'll pay on a $300,000 home loan at 5.5% interest. Monthly, fortnightly, and weekly repayments with total interest and savings tips.

Last verified: 1 July 2025

Monthly repayments on a $300,000 mortgage at 5.5% over 30 years: $1,703.37

Monthly

$1,703.37

Fortnightly

$786.17

Weekly

$393.08

Total cost over 30 years

$613,212

Principal $300,000 + Interest $313,212

Total interest paid

$313,212

104% of the loan amount

25-Year vs 30-Year Term

	25 years	30 years	Difference
Monthly repayment	$1,842.26	$1,703.37	+$138.90/mo
Total interest	$252,679	$313,212	Save $60,533
Total repaid	$552,679	$613,212	Save $60,533

What If Rates Change?

Rate	Monthly	Fortnightly	vs current
5%	$1,610.46	$743.29	-$92.90/mo
5.5%(current)	$1,703.37	$786.17	—
6%	$1,798.65	$830.15	+$95.28/mo
6.5%	$1,896.20	$875.17	+$192.84/mo
7%	$1,995.91	$921.19	+$292.54/mo

Income Needed

You'd need a household income of approximately $68,135/year ($5,678/month) to comfortably afford this mortgage using the 30% rule — where no more than 30% of your gross income goes toward housing costs.

Extra Repayment Impact

Paying an extra $100/week on your $300,000 mortgage:

Saves $132,100 in interest
Pays off your loan 11.2 years sooner

Fortnightly vs Monthly Trick

Paying $851.68 fortnightly (half the monthly repayment) instead of $1,703.37 monthly means you make 26 half-payments per year — equivalent to 13 monthly payments instead of 12.

Interest saved: $62,255
Time saved: 5.1 years

Frequently Asked Questions

How much are repayments on a $300,000 mortgage?

At 5.5% over 30 years, monthly repayments on a $300,000 mortgage are $1,703.37. Fortnightly repayments are $786.17 and weekly repayments are $393.08.

What income do I need for a $300,000 mortgage?

Using the 30% rule (no more than 30% of gross income on housing), you would need a household income of approximately $68,135 per year to comfortably afford a $300,000 mortgage at 5.5%.

How much interest will I pay on $300,000 over 30 years?

At 5.5%, the total interest on a $300,000 mortgage over 30 years is $313,212. The total amount repaid would be $613,212.

What if interest rates rise above 5.5%?

If rates rise by 1% to 6.5%, monthly repayments on a $300,000 mortgage increase to $1,896.20 — an extra $192.84 per month.

Other Mortgage Amounts

$200K mortgage $250K mortgage $350K mortgage $400K mortgage $450K mortgage

Other Interest Rates

$300,000 at 4%$300,000 at 4.5%$300,000 at 5%$300,000 at 6%$300,000 at 6.5%$300,000 at 7%$300,000 at 7.5%$300,000 at 8%

General information and estimates only — not financial, tax, or legal advice. Always verify with a licensed adviser or the ATO.

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