Your spouse’s income can be used for investments. If both you and spouse choose to invest in conservative financial instruments, make an investment in fixed deposits, gold, PPF and even tax saving bonds. If you and spouse decide to invest aggressively, choose an investment in equity (equity mutual funds + stocks).
Subsequently, how should married couples split finances?
You need a system for paying bills that feels fair to both of you. Some couples pay their household bills from a joint account to which both spouses contribute. Others divide the bills, with each partner paying his or her share from their individual accounts. What’s important is to make it an equitable division.
Keeping this in view, how do working couples manage finances? Insurance: Working couples have a dual-income hence to save costs; they should invest in joint insurance policies (health and life) that cover both the partners in a single policy. The joint cover policy is often cheaper and more convenient since it involves a single premium payment and single payout.