$300,000 Mortgage at 8%

See exactly what you'll pay on a $300,000 home loan at 8% 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 8% over 30 years: $2,201.29

Monthly

$2,201.29

Fortnightly

$1,015.98

Weekly

$507.99

Total cost over 30 years

$792,466

Principal $300,000 + Interest $492,466

Total interest paid

$492,466

164% of the loan amount

25-Year vs 30-Year Term

	25 years	30 years	Difference
Monthly repayment	$2,315.45	$2,201.29	+$114.15/mo
Total interest	$394,635	$492,466	Save $97,831
Total repaid	$694,635	$792,466	Save $97,831

What If Rates Change?

Rate	Monthly	Fortnightly	vs current
7.5%	$2,097.64	$968.14	-$103.65/mo
8%(current)	$2,201.29	$1,015.98	—
8.5%	$2,306.74	$1,064.65	+$105.45/mo
9%	$2,413.87	$1,114.09	+$212.57/mo
9.5%	$2,522.56	$1,164.26	+$321.27/mo

Income Needed

You'd need a household income of approximately $88,052/year ($7,338/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 $229,490 in interest
Pays off your loan 12.2 years sooner

Fortnightly vs Monthly Trick

Paying $1,100.65 fortnightly (half the monthly repayment) instead of $2,201.29 monthly means you make 26 half-payments per year — equivalent to 13 monthly payments instead of 12.

Interest saved: $138,895
Time saved: 7.2 years

Frequently Asked Questions

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

At 8% over 30 years, monthly repayments on a $300,000 mortgage are $2,201.29. Fortnightly repayments are $1,015.98 and weekly repayments are $507.99.

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 $88,052 per year to comfortably afford a $300,000 mortgage at 8%.

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

At 8%, the total interest on a $300,000 mortgage over 30 years is $492,466. The total amount repaid would be $792,466.

What if interest rates rise above 8%?

If rates rise by 1% to 9%, monthly repayments on a $300,000 mortgage increase to $2,413.87 — an extra $212.57 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 5.5%$300,000 at 6%$300,000 at 6.5%$300,000 at 7%$300,000 at 7.5%

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

RBA Interest Rate Changes 2026: Impact on Your Mortgage Repayments

How RBA cash rate changes in 2026 affect your mortgage repayments. Includes repayment impact per $100K borrowed, fixed vs variable analysis, and how to stress-test your mortgage.

Should You Fix Your Mortgage in 2026? Fixed vs Variable Rate Analysis

With oil prices dropping and inflation easing, is now the time to fix your mortgage? Detailed pros and cons analysis of fixed vs variable rates in the current Australian market.

RBA Interest Rate Decision March 2026: What It Means for Your Mortgage & Savings

Analysis of the RBA's March 2026 interest rate decision — impact on mortgage repayments, savings accounts, borrowing power, and what to expect for the rest of the year.