As a Certified Mediator it is always important to know what the tax rules are in separation and divorce.  I am also a tax practitioner that also needs to know the rules.  Each year this is a subject that I review very carefully because tax laws change yearly.  Thus, here are the basics that everyone going through separation and divorce should discuss with their tax advisor as they go through the process.
Ten Tax Considerations in Divorce.  The following is taken from https://familylawyermagazine.com/articles/top-ten-tax-considerations-in-divorce/​ 
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1. Spousal support payments are commonly used in divorce settlements to shift cash from one spouse to another to provide income. It’s important to understand how these payments will impact your client’s taxable income and cash flow. Alimony is one type of spousal support payment. The Tax Cuts and Jobs Act tax legislation changed the tax treatment of alimony paid and received: any divorce or separation agreement instituted on or after January 1, 2019 is governed by the new tax law and alimony income is not taxable to the recipient and there is no tax deduction for alimony paid. The tax treatment of alimony for agreements completed by December 31, 2018 was not changed by this legislation and payments that qualify as alimony are taxable income to the payee and tax deductible to the payer.
2. Not all payments made from one spouse to another are considered alimony. In order for spousal support to qualify as alimony, the payments need to be made pursuant to a divorce decree or separation agreement. Payments must be made in cash, not property. The spouses may not live in the same household, they may not file a joint tax return, and there can be no requirement that payments be made to the payee after death.
3. Determining an individual’s projected post-divorce cash flow is essential in divorce financial planning. An analysis of projected cash flow enables you to determine if a proposed divorce settlement will allow your client to maintain his or her current lifestyle by considering their anticipated income and spending needs. Your client will need to provide you with their current sources of income, anticipated expenses, and their assets and liabilities in order for you to determine an equitable divorce settlement. This information can also be used to simulate potential asset division scenarios that can be analyzed to project estimates of your client’s annual cash flow and the length of time that the client’s assets will last based on their spending needs. Providing this type of cash flow analysis to your client will help them feel confident in their financial future after the divorce is finalized.
4. A tax advisor can determine any tax ramifications of assets or liabilities your client will receive in the divorce. Each type of asset can be taxed differently – even when they seem to be comparable assets. One example is the division of retirement assets such as a 401k or IRA. There is a big tax difference between receiving Traditional or Roth IRA or retirement plan assets: Traditional IRA and retirement plan assets are taxable when the assets are distributed to the beneficiary and Roth IRA and retirement plan assets are distributed to the beneficiary tax-free. Real estate received as part of a divorce settlement may be taxable when the asset is sold, so it is important to know the cost basis of any real estate received along with any tax deductions that have been claimed on the real estate (such as deprecation). The cost basis and depreciation will impact your taxable income when this asset is sold. The potential tax on the sale or distribution of assets received in a divorce should be considered when dividing these assets.
5. Once your client is separated or divorced, there will likely be a change to their tax filing status. A taxpayer’s tax filing status is used to determine a number of factors on the tax return – including, but not limited to, the tax rate. A taxpayer’s marital status on the last day of the tax year determines the filing status for that entire tax year. An individual will be considered to be divorced for the entire year if the divorce was finalized on or before December 31 of the tax year. A divorced individual is able to use the Single or Head of Household filing status for the tax year in which the divorce was finalized.
6. Going through a divorce can be a long process and, in many cases, a couple in the middle of a divorce is still married at the end of the tax year. Taxpayers not legally divorced or separated on December 31 are considered married for that tax year and will have the option to file their tax returns as Married Filing Jointly, Married Filing Separately, or Head of Household. The Married Filing Jointly filing status will usually result in a lower overall tax bill, but many individuals don’t want to have to work with their spouse to file the return as they may disagree regarding factors that impact the return. If your client is in this situation, then their next best option may be the Head of Household filing status.
7. The Head of Household filing status is typically more advantageous than the Single or Married Filing Separately filing statuses if the taxpayer has a dependent child. A taxpayer is able to file as Head of Household if they are not married or are legally separated at the end of the tax year – or if the taxpayer did not live with their spouse for the last six months of the tax year. The taxpayer also has to have paid for more than one-half of the costs to maintain the household, and the taxpayer’s child(ren) must qualify as dependents and live with the taxpayer for more than one-half of the year. Your client should know that there are options when trying to determine the correct filing status; a tax advisor can work with your client to determine the most advantageous filing status for their circumstances.
8. If filing a separate return this year, your client will need to figure out their income separately so that each spouse reports the proper amount of income. If your client has been filing a return jointly with his or her spouse since they were married, then they reported all of their income on the same tax return without having to determine which income belonged to each spouse. Determining the proper allocation of income and deductions in the tax year a divorce is finalized or when a divorcing couple chooses to file separately is dependent on the distribution laws of the state where the divorce decree will be issued. Taxpayers in most community property states are required to equally split all community income up to the date of the divorce decree. After the divorce has been finalized, the individual who earned it must report all income from that date through the end of the tax year. Taxpayers divorcing in an equitable distribution state will report all income they earned individually as well as any income received from property they personally own.
9. Are any of the attorney or advisor fees incurred during a divorce tax deductible? Fees paid for tax planning and legal tax advice are not tax deductible for federal purposes. Unfortunately, the Tax Cuts and Jobs Act legislation repealed the deduction for legal and other professional fees for individual taxpayers beginning January 1, 2019. This provision of the law does sunset, meaning that as of January 1, 2026, the deduction for legal and professional fees will once again be allowed. There are some states that still allow a tax deduction for legal and professional fees, so your client should discuss the tax deductibility of these fees with a tax advisor to ensure you don’t miss a tax deduction.
10. An overpayment on your client’s prior year tax return that has been applied to next year’s estimated tax and estimated tax payments that have been paid during the tax year can be allocated between spouses. The IRS allows taxpayers to allocate these payments in any agreed upon manner as long as you attach an explanation for the allocation to the tax return when filing. The distribution laws in your client’s state may dictate the allocation of these payments, however. The payments will likely have to be allocated equally to each spouse if the divorce is in a community property state and the tax payments were made with community funds. The laws for equitable distribution states may require that any estimated tax payments be divided among spouses in proportion to each spouse’s separate tax liability.

Taken from Family Lawyer Magazine.

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