Maintenance, or spousal support, is crucial when major life changes occur within family dynamics. Use our Texas maintenance calculator.Unlike with child support, Texas doesn't have a formula for calculating spousal maintenance. Spousal maintenance is only available in Texas divorce cases. In this article, learn about how spousal maintenance is ordered, the requirements to be eligible for spousal maintenance, and other important information. Once the spouses' gross incomes and marriage length have been entered into the Texas Maintenance Calculator, click the "Calculate Alimony" button. Using a Child Support Calculator in Texas. A child support calculator helps you estimate what you might pay or receive. In most cases, the Texas Family Code provides that spousal maintenance may only be ordered for spouses that have been married for 10 years or longer. Alimony Lawyers in Forth Worth.