Moves you make between now and the end of the year can have a significant effect on how much tax you have to pay next April, particularly when it comes to investments you might hold outside a retirement account. But time is running short. Review our list and get cracking. Employers adjusted workers’ withholding earlier this year to reflect the federal tax overhaul, which reduces tax rates and doubles the standard deduction. But the new law also limits or scraps some popular t