The tax owed by a married couple filing jointly and their tax rates can be found in the following tax rate schedule.

From this schedule, the tax rate R(x) is a function of taxable income x, as follows.

Identify any discontinuities in R(x).

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Married Filing Jointly or Qualifying Widow(er) If taxable But not The tax income is over- rate is: over- $0 $18,150 $73,800 $148,850 $226,850 $405,100 $457,600 $18,150 $73,800 $148,850 $226,850 $405,100 $457,600 no limit 10% 15% 25% 28% 33% 35% 39.6% 0.10 if 0457,600