Few people would voluntarily overpay the IRS by hundreds of thousands of dollars, but one retired accountant did exactly that in a bid to hide money from his wife.
The CPA behind this creative scheme was preparing for a divorce, said Peggy L. Tracy, a certified financial planner and owner of Priority Planning in Wheaton, Illinois.
The accountant's wife — then Tracy's client — became suspicious after noticing her husband didn't file the couple's tax returns for two years. After asking the IRS for a history of tax payments made, Tracy uncovered a surprise.
"His tax bill every year was about $40,000, but we found out he was putting away hundreds of thousands in estimated payment vouchers and just leaving the money there," Tracy said.
"If you're given a limited budget and you don't get access to financial information, that's a clear red flag." -Christy Bastian, CPA and president, FVL Consultants
"He was parking the money with the IRS," she said.
In all, the retired CPA made more than $500,000 in extra tax payments, pulling the money from a brokerage account.
"His theory was that when he got divorced, he'd be single, he'd file his back taxes and get the money out," said Tracy. "We caught him and did the back tax returns, so it was about $200,000 in tax refunds for both."
When it comes to uncovering a spouse's hidden assets and income, your tax return just might be the key to chasing down that cash and getting an equitable split in a divorce.
Here's what you need to know.
Take apart your 1040 
Your individual income tax return and the forms you need to prepare it have more than just the details on the amount you and your spouse earned in a given year.
Form W-2, for instance, contains data on how much your spouse earns, the amount they save in workplace plans and what they're withholding in income taxes.
The cleverest of divorcees may stretch the truth about their after-tax income by throwing more money into a 401(k) plan, a deferred compensation plan or a health savings account — a tax-advantaged account you can use to pay for qualified medical expenses.
"Sometimes they funnel money to a company that they set up innocently years ago when everything was fine." -Philip Segal, attorney and founder of Charles Griffin Intelligence in New York
High deferrals into these and other savings accounts at work reduce take-home pay. Soon-to-be exes try to use this to argue for reduced alimony and child support obligations.
"They'll say they don't have any money, but they're paying this much into their 401(k) plan so that it lowers their support payments," said Christy Bastian, CPA and president of FVL Consultants in Marco Island, Florida.
"Looking at the paystub will tell you if there are undisclosed assets," she said. "It could indicate there's a retirement account." Such a find can be valuable in a divorce, as assets in a 401(k) can be divided through a qualified domestic relations order.
Secret accounts 
Here are two tax forms that might help you uncover hidden assets and secret spending: Schedule B, which contains details on interest and dividends, and Schedule D, which addresses capital gains and losses.
Both forms are a necessary part of filing your income tax return.
"Sometimes we find accounts because you were stashing away money, and there might be an interest income statement that comes in," said Tracy.
"As for capital gains and losses, are you taking money out of a brokerage account and not reinvesting it?" she asked.
You should also keep an eye out for Form 1099-R, which taxpayers receive when they've made distributions from retirement accounts.
"People don't want to look at their financial accounts on a monthly basis," said Tracy. "It gives people an opportunity to hide money because nobody is watching."
Risky business 
Entrepreneurs can be creative when it comes to squirreling away cash and hiding affairs.
"Sometimes they funnel money to a company that they set up innocently years ago when everything was fine," said Philip Segal, an attorney and founder of Charles Griffin Intelligence in New York.
In one case, a husband with a company in New York decided to form a second entity with the same name in Florida. His wife, Segal's client, suspected that her husband was having an affair with another woman in that state.
A search of corporate and business entities in Florida turned up an address for the business — which happened to correspond with the other woman's apartment, Segal said.
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Though the company was listed at her address, there was no evidence the company did any business in Florida, he said.
Tax returns linked to the business can also spell out cash flow details, including unusual spending patterns.
"If you're in the midst of a divorce, you have document discovery and you can get into the tax records," said Segal. "Or if you have the same accountant, you can see the business tax records."
Sighting red flags
