Most couples spend months planning a wedding and very little time planning how their finances will work once they are married. Money is one of the most common sources of tension in relationships, and many of the problems couples run into later could have been avoided with a few honest conversations and some practical paperwork at the start.
Combining finances is not just about opening a joint account. Marriage changes your legal position in ways many people do not expect. In South Australia it can revoke an existing will. It affects how your super, property and debts are treated, and it changes how Centrelink and some government schemes assess you. Getting the structure right early is far easier than untangling it later.
This guide covers the conversations to have, the decisions to make, and the documents to update, both before and after you marry. Most of it applies equally to de facto couples.
Ways to structure your money as a couple
There is no single right way to combine finances. Most couples use one of three broad approaches.
| Fully joint | Fully separate | Yours, mine and ours | |
|---|---|---|---|
| How it works | All income goes into joint accounts and all spending comes from them | Each partner keeps their own accounts and splits shared bills | A joint account for shared costs and goals, plus individual accounts for personal spending |
| Strengths | Simple, transparent and treats all money as shared | Independence and clear personal control | Shared goals with personal freedom, and fewer arguments over small purchases |
| Watch out for | Different spending habits can cause friction, and either partner can lose a sense of financial independence | Can be unfair when incomes differ, and makes shared goals harder | Needs agreement on how much each contributes |
| Often suits | Couples with similar habits and long-term commitment | Couples who marry later with established assets | Most couples, especially with different incomes |
When incomes differ significantly, many couples contribute to shared costs in proportion to income rather than 50/50. That keeps the arrangement fair, especially when one partner reduces work to care for children. Our guide on how to structure your cash flow sets out a practical system for shared accounts and automated savings.
Before you marry: the conversations to have
The most valuable step costs nothing. Before combining finances, sit down together and share the full picture.
- Income and job security. What each of you earns, how stable it is, and your career plans.
- Debts. Credit cards, personal loans, car finance, buy now pay later accounts, HECS-HELP debts, and any loans to family or business partners.
- Assets. Savings, super balances, property, shares, business interests and any expected inheritances.
- Spending habits and attitudes. Whether you are each a saver or a spender, and what you each consider a big purchase.
- Financial commitments to others. Child support, financial help for parents, or guarantees you have signed.
- Goals. Buying a home, children, schooling, travel, career breaks, and when you each want to retire.
Many couples find it helpful to each obtain a free copy of their credit report before these conversations. It provides an objective starting point and can surface forgotten accounts or defaults.
If one of you has a HECS-HELP debt, it is worth understanding how it affects borrowing capacity and cash flow. Our guide to financial planning with a HECS debt covers the issues.
Before you marry: decisions to make
Should you have a binding financial agreement?
A binding financial agreement, often called a prenup, is a legal agreement under the Family Law Act that sets out how property and finances will be divided if the relationship ends. It can be made before marriage, during marriage, or after separation, and de facto couples can make similar agreements.
Agreements are most common where one partner brings significantly more assets into the relationship, owns a business, expects a large inheritance, or has children from a previous relationship. For an agreement to be binding, each partner must receive independent legal advice before signing, and the agreement must meet strict formal requirements. Agreements that are not properly prepared can be set aside by a court.
A binding financial agreement is a legal matter and should be prepared by a family lawyer. A financial planner can help you understand your financial position and what you are protecting before you see the lawyer.
How will you own property?
If you are buying a home together, how you hold the title matters. As joint tenants, the property automatically passes to the surviving owner on death, regardless of what either will says. As tenants in common, each owner holds a defined share that passes under their own will. Couples with children from previous relationships, or who contribute unequal amounts, often prefer tenants in common. Our guide to joint tenants versus tenants in common explains the difference.
If parents are contributing to a home deposit, decide whether the money is a gift or a loan, and document it. A documented loan is treated very differently from a gift if the relationship later ends. Our guide to the Bank of Mum and Dad covers how parents can help without putting their own finances at risk.
First home schemes
Many first home grants and concessions assess a couple together. If one partner has owned property before, the couple may lose access to some first home benefits. It is worth checking eligibility before marrying or buying, as the order of events can affect what you can claim.
After you marry: what to update
Your wills
In South Australia, marriage revokes an existing will unless the will was made in contemplation of that marriage. Many newly married people do not realise that the will they made years earlier no longer applies, and that if they die without a new one, the intestacy rules decide who receives their estate.
Making new wills is one of the most important things to do after marrying. For couples with children from previous relationships, the will needs particular care, because what feels fair to one partner may not provide for the other’s children. Our guides on why estate planning gives you the final say and family provision claims in South Australia explain what is at stake.
Super death benefit nominations
Your super does not automatically form part of your estate, and your will does not control it. Instead, your super fund pays death benefits according to your nomination, or at the trustee’s discretion if you have not made a binding one.
After marrying, review the nomination on every super account. A nomination in favour of parents or a former partner may no longer reflect your wishes, and some nominations lapse after three years if they are not renewed. Our guide to super and your will explains how the two interact.
Insurance
Once you share a mortgage or plan to have children, each partner’s income becomes important to the other. Review life, total and permanent disability, and income protection cover, including cover held inside super, and update beneficiaries. Also check that home, contents and car insurance reflect both partners as owners or drivers.
Powers of attorney
A spouse does not automatically have authority to manage your finances or make medical decisions if you lose capacity. An enduring power of attorney and an advance care directive allow you to choose who can act for you. Our guide to powers of attorney and advance care directives in South Australia explains how they work.
Name changes
If either partner changes their name, update identification documents, bank accounts, super funds, insurance policies, the ATO, Medicare, and any property titles or investment holdings. Mismatched names can delay super payouts, insurance claims and property settlements.
Tax and government payments
Australia does not have joint tax returns. Each partner lodges their own return and is taxed on their own income. However, your spouse’s details and income are included in your return, because they affect the Medicare levy surcharge, private health insurance rebate and some tax offsets.
Because each partner is taxed separately, the ownership of investments matters. Holding investments in the name of the partner on the lower tax rate can reduce the tax paid on investment income, although this has to be weighed against other factors, such as who has the higher capital gains, asset protection and what happens if the relationship ends. Our guide on aligning your investments and super with your tax strategy covers this in detail.
For Centrelink and Family Tax Benefit purposes, couples are generally assessed together from when they start living together, whether married or not. Tell Services Australia about the change in circumstances promptly to avoid overpayments.
Super strategies for couples
Couples can manage super together even though each account belongs to one person. Common strategies include:
- Spouse contributions. If your spouse earns less than $37,000 a year, contributing up to $3,000 to their super can provide a tax offset of up to $540. The offset phases out completely at $40,000.
- Contribution splitting. Up to 85% of one partner’s concessional contributions can be split to the other’s super the following year, helping balance super between partners.
- Balancing for retirement. More even balances can provide more flexibility in retirement, particularly around the transfer balance cap and access to super if one partner is younger.
These strategies are particularly valuable when one partner takes time out of the workforce to raise children, as their super would otherwise fall behind. Our guide on investing inside or outside super covers how to weigh super against other investments.
Debt: what you share and what you don’t
Marriage does not make you responsible for debts your partner took on in their own name. But you are responsible for joint debts, and if you co-sign or guarantee a loan for your partner, you are liable for the full amount if they cannot pay.
Joint debts affect both partners’ credit histories, and lenders consider both incomes and both sets of debts when assessing a joint home loan. If one partner has significant high-interest debt, it often makes sense to agree a plan to pay it down before combining finances fully or applying for a mortgage.
Each partner should keep some financial independence and visibility, including access to their own account and knowledge of the household’s finances. Financial control by one partner is recognised as a form of family violence in Australian family law, and staying informed about shared money protects both partners.
Blended families and second marriages
Couples who marry later in life, or have children from previous relationships, face more complex decisions. Both partners usually bring assets, super and expectations about what will go to their own children.
Careful planning often includes a binding financial agreement, wills that balance provision for the new spouse and for each partner’s children, binding super death benefit nominations, and sometimes testamentary trusts. Our guides to testamentary versus family trusts and asset protection across wealth structures cover the tools available.
Setting shared goals
Once the paperwork is sorted, the most useful step is agreeing on shared goals and a plan for reaching them. That usually includes an emergency fund, a timeline for buying a home or paying down the mortgage, plans for children, how you will each build super, and what you want your life to look like in 10 and 20 years.
A written plan helps couples make consistent decisions and reduces arguments about individual purchases. Our guides to balancing short-term goals with long-term financial security and financial planning in your 30s, 40s and 50s cover how priorities shift over time.
Where professional advice adds value
Combining finances is one of the biggest financial transitions most people go through. It touches cash flow, debt, property, tax, super, insurance and estate planning at once, and decisions made early, such as how you own your home or whose name investments are held in, can have consequences for decades.
A financial planner can help you and your partner build a plan around your shared goals, structure accounts and investments to suit your incomes and tax rates, set up super strategies that keep both partners on track, and coordinate with your lawyer on wills, binding financial agreements and powers of attorney. Our guide to financial planning after a major life change covers how advice fits around life events like marriage.
If you are planning to marry or have recently married, our financial planning team in Adelaide can help you get your finances working together. If you have not used a financial planner before, our guide to what happens in your first meeting explains what to expect.
Frequently asked questions
Does getting married revoke my will in South Australia?
Yes. In South Australia, marriage revokes an existing will unless the will was made in contemplation of that marriage. If you do not make a new will, your estate may be distributed under the intestacy rules rather than according to your wishes.
Do we need a prenup in Australia?
A binding financial agreement is not required, but it can be valuable where one partner brings significantly more assets, owns a business, expects an inheritance, or has children from a previous relationship. Each partner must receive independent legal advice for the agreement to be binding.
Am I responsible for my partner’s debts after we marry?
Not for debts in your partner’s sole name. You are responsible for joint debts, and for any loan you have co-signed or guaranteed. Lenders will consider both partners’ debts when assessing a joint home loan application.
Should we have joint or separate bank accounts?
It depends on your circumstances and preferences. Many couples use a combined approach, with a joint account for shared bills and goals, and individual accounts for personal spending. Contributing to shared costs in proportion to income is often fairer when incomes differ.
Do married couples lodge joint tax returns in Australia?
No. Each partner lodges their own tax return and is taxed on their own income. Your spouse’s income is still included in your return because it affects the Medicare levy surcharge, the private health insurance rebate and some offsets.
Can I contribute to my spouse’s super?
Yes. If your spouse earns less than $37,000 a year, contributing up to $3,000 to their super can provide a tax offset of up to $540, phasing out at $40,000. You can also split up to 85% of your concessional contributions to your spouse’s super.
Do these issues apply to de facto couples?
Mostly, yes. De facto couples are treated similarly to married couples for Centrelink, tax and family law property purposes once certain conditions are met, generally after two years together. One key difference is that, in South Australia, entering a de facto relationship does not revoke an existing will, although it should still be reviewed.
General advice warning. This article contains general information only and does not take into account your objectives, financial situation or needs. It is not legal advice. Wills, binding financial agreements, property title and family law matters should be discussed with a qualified lawyer. Tax, super and Centrelink rules are subject to change. You should consider whether the information is appropriate for you and seek personal financial and legal advice before acting on any of it. Money Path Pty Ltd is a Corporate Authorised Representative (No. 001306822) of Australia National Investment Group, AFSL 522028.
