Mortgage interest can be a complex topic, but understanding how it works can help you navigate the process with ease. Typically, mortgage interest accrues daily, but the specifics can vary depending on the type of loan you have.
Most lenders use a 365-day year, which means interest is calculated as a fraction of a day, even on holidays and weekends. This means you'll be charged interest on your outstanding balance every single day, not just on the anniversary of your loan.
This daily accrual can add up quickly, and it's essential to factor it into your budget and financial planning. For example, if you have a $200,000 loan with a 4% interest rate, you can expect to pay around $800 in interest per year, assuming a 30-year loan term.
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Accrual Basics
Accrual is the process of interest accumulating and being added to the balance of an account.
The financial term "accrue" means to accumulate, which is exactly what happens with daily interest accrual.
Interest can accrue on various types of accounts, including credit cards, mortgages, and student loans. Borrowers often dread this process.
Daily interest accrual can also occur on investments, such as bonds, certificates of deposits (CDs), and savings accounts. This can be a positive experience for investors.
Interest accrual can compound emotions, making borrowers anxious and investors hopeful.
How Mortgage Interest Works
Mortgage interest can be a bit tricky to understand, but it's actually pretty straightforward. Most mortgage interest is calculated on a monthly basis, using a formula that takes into account the outstanding loan balance and the interest rate.
In the US, for example, mortgage interest is usually calculated using the 30/360 method, which assumes that each month has 30 days and a year has 360 days. This can result in some variation in the amount of interest accrued from month to month.
The amount of interest you pay each month will depend on your loan balance, interest rate, and the number of days in the month.
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Compounding
Compounding is a key concept in understanding how mortgage interest works. It increases the account balance on which the accrual calculations are made.
If interest compounds monthly, the daily accrual amount remains the same, but the total daily accrued interest is added to the balance on the compound date, creating a new base amount. This new balance is then used to calculate the next phase of daily interest accrual.
Compounding more often than monthly, such as daily or quarterly, will increase the daily accrued interest and make the total amount grow more quickly. For example, in the previous $100,000 mortgage example, the daily accrual amount is $41.0958.
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How Variable Mortgage Rates Work
Variable mortgage rates can fluctuate up or down, and they can change multiple times during your term.
A variable-rate mortgage doesn't come with an amortization table showing a steady decline in the amount earmarked for interest each month, as you see with a fixed-rate mortgage.
The amount of a mortgage payment going toward interest could be more than the month prior, and in some instances, your mortgage payment itself could increase.
As a general rule, if the Bank of Canada's prime rate changes, your mortgage interest rate will change with it.
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Calculating Accrued Interest
Calculating accrued interest can be a bit tricky, but it's essential to understand how it works, especially when it comes to mortgages.
Credit card agreements generally calculate interest daily, while mortgages and other loan accounts calculate interest monthly.
To calculate monthly accrued interest, you need to determine the monthly interest rate by dividing the annual interest rate by 12.
For example, if your annual interest rate is 18%, your monthly interest rate would be 18% / 12 = 1.5%.
This amount needs to be converted from a percentage to a decimal by dividing by 100, so 1.5% becomes 0.015.
To determine the account's average daily balance, you need to add up the principal balance on each day of the month and then divide by the number of days in the month.
For instance, if you had a $1,000 balance on an account for the first 10 days of a 30-day month and then borrowed an additional $500, your average daily balance would be ($1,000 + $500) / 30 = $1,333.
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If your interest rate is 18%, you can calculate your monthly interest rate and convert it into a decimal as follows:
Monthly interest rate = 18% / 12 = 1.5%
Decimal conversion = 1.5% / 100 = 0.015
Monthly accrued interest = 0.015 x $1,333 = $20
Daily interest charges can be calculated by dividing the annual interest rate by 365 days in a year, then converting to a decimal and multiplying by the loan balance.
For example, a 30-year, $250,000 VA mortgage at a fixed 4.5 percent would have a daily interest charge of $30.823.
Types of Mortgage Rates
Mortgage rates come in different flavors, and understanding them can help you make informed decisions about your mortgage. There's a big difference between fixed and variable rates.
A fixed mortgage rate means your interest rate stays the same for the entire term, even though the amount allocated toward interest changes over time. This is because your mortgage principal starts accruing interest at your agreed-upon rate as soon as the loan closes, and the process works similarly to how you earn interest on deposits in a savings account.
With a fixed mortgage, you know exactly how much you'll pay each month, which can be a big relief. The cycle of paying interest and principal continues, but the amount allocated toward interest decreases over time as you pay down the principal.
Variable mortgage rates, on the other hand, can change over time, based on market conditions. This means your monthly payment could go up or down, depending on the interest rate.
Here's a simple way to think about it: fixed rates offer stability, while variable rates offer flexibility. However, variable rates come with a risk that rates could go up, increasing your monthly payment.
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Payment and Charges
Calculating daily interest charges is a crucial aspect of understanding how mortgage interest accrues. The example of a 30-year, $250,000 VA mortgage at a fixed 4.5 percent illustrates this.
To calculate daily interest, you divide the annual interest rate by 365 days in a year. In this example, 4.5 percent divided by 365 days equals 0.01232.
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Daily interest can be substantial, as seen in our example where the daily interest charge would be $30.823. This is calculated by multiplying the daily percentage by the loan balance.
Prepaid interest charges can add up quickly, especially if you close on a date near the end of the month. For instance, closing on May 27 would result in $154.12 in prepaid interest charges, while closing on May 15 would result in $523.99.
The key takeaway is that closing toward the end of the month can be advantageous, but it ultimately depends on your specific situation, including your cash flow and what you owe at closing.
Here's a breakdown of the daily interest charges for our example:
Sources
- https://www.investopedia.com/ask/answers/040315/what-does-it-mean-when-interest-accrues-daily.asp
- https://www.fool.com/terms/a/accrued-interest/
- https://www.nerdwallet.com/ca/mortgages/how-does-mortgage-interest-work
- https://www.consumerfinance.gov/rules-policy/regulations/1030/7/
- https://www.veteransunited.com/valoans/daily-interest-charges/
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