If you allow too much tax to be withheld, you get a refund. You can determine how much is tax is taken out of your pay by the number of allowances you claim on your W-4. The W-4 has a worksheet to help you figure out how many personal allowances to take.
Step 5: Predict your next period. Now that we know how long your period cycle is, we can just use it to count the days to predict your next period. My period cycle is 28 days so if I count 28 days from February 10, that's when my next period should come.
Recognize the first day of your cycle. Understanding the days of your cycle empowers you to make decisions about your health and family planning. To begin determining the first day of your period and the length of your cycle, start by numbering the days of your cycle from the first day of your next period. Day one of your cycle occurs with the start of your period. Thus, mark your calendar with X on the day your period starts.