There are two ways for a dual-income couple to structure a mortgage: the "pair loan" (pea rōn), where each spouse signs a separate loan contract, and "income combination" (shūnyū gassan), where one spouse is the contracted borrower and the other's income is added in for screening purposes. In short, the basic thinking is that a pair loan suits couples who each want to claim the home loan tax deduction, while income combination suits those who want to keep the paperwork simple. Both are ways of using combined household income to increase your borrowing capacity, but they differ in how the contracts are structured and how the risk is shared.
- A pair loan has each spouse becoming a separate contracted borrower, with two independent mortgages.
- Income combination has one spouse as the contracted borrower, with the other's income added in to increase the borrowing capacity.
- A pair loan raises the possibility of each spouse claiming the home loan tax deduction, but it also means two contracts, and closing costs for both.
- Income combination comes in two forms — "joint debtor type" and "joint guarantor type" — and they differ in how the home loan tax deduction applies.
- Both approaches need to be considered with an eye to the risks tied to life-event changes, such as divorce or a drop in income.
How a Pair Loan Works
A pair loan is a method where each spouse signs a separate mortgage contract and becomes a debtor in their own right. Because each is screened on their own income, this has the advantage of increasing the household's total borrowing capacity even when one income alone wouldn't be enough. On the other hand, having two contracts means closing costs — administrative fees, stamp duty, and so on — apply to each one separately. Group credit life insurance (danshin) is also typically taken out separately by each contracted borrower, so the extent of coverage in the event something happens needs to be checked for each individually.
How Income Combination Works
Income combination is a method where a single primary borrower signs the loan contract, and the other spouse's income is added in for screening purposes. There are two ways to combine income: the "joint debtor type," where the other spouse also carries repayment responsibility, and the "joint guarantor type," where they don't carry repayment responsibility but instead act as a guarantor. Because there's only one contract, the paperwork tends to be simpler than with a pair loan. The terms of income combination — including options like Flat 35 through the Japan Housing Finance Agency — vary by lender and product.
How the Home Loan Tax Deduction Differs
Because each spouse is a debtor under a pair loan, both may be eligible to claim the home loan tax deduction if they meet the requirements. Among income combination options, the joint debtor type includes the non-borrowing spouse as a debtor too, so both may be able to claim a deduction proportional to their ownership share — but under the joint guarantor type, typically only the contracted borrower is eligible. Exactly how much of a deduction each method produces depends on the loan amount and ownership share, so we recommend running the numbers for your own case.
The Difference in Closing Costs and Paperwork
With a pair loan, having two contracts means closing costs — administrative fees, stamp duty, registration costs — are incurred for each one, so the total tends to be higher than with income combination. Income combination requires only one contract, making it easier to keep the paperwork and closing costs down, but the increase in borrowing capacity may be smaller than with a pair loan.
Risks Worth Weighing When You Choose
Both approaches carry the risk that a future divorce, or a drop in income from maternity/childcare leave or a career change, could affect repayment. With a pair loan or the joint debtor type in particular, note that the repayment obligation for both parties remains even if one spouse's income stops. It's important to consider which approach suits you with an eye to future life events. To prepare for these risks, it's reassuring to also check the coverage details of your group credit life insurance and whether any repayment relief programs exist for a drop in income.
Frequently Asked Questions
Which allows for a bigger loan — a pair loan or income combination?
Both let you reflect combined household income in screening, but because each spouse is an independent borrower under a pair loan, it tends to be easier to increase your borrowing capacity that way. That said, screening criteria vary by lender.
Can I claim the home loan tax deduction with income combination?
Under the joint debtor type, both spouses may be able to claim a deduction proportional to their ownership share. Under the joint guarantor type, typically only the contracted borrower is eligible. It's necessary to check the details for your own case.
What happens to a pair loan or income combination arrangement if the couple divorces?
The repayment obligations under each contract don't automatically disappear because of a divorce. Handling it typically requires individual measures such as a change of ownership or refinancing, so it's important to understand this risk in advance.
Summary
Both a pair loan and income combination are ways for dual-income couples to increase their borrowing capacity, but they differ in how the home loan tax deduction applies, in closing costs, and in how future risk is shared. Consider which approach suits your life plan and financial plan.