I have 2 IRA accounts and I should have taken my RMD. One is OK but I forgot to take my RMD from the 2nd one. What should I do now?

Follow these steps:

1. Immediately take the one you missed. 
2. Add the missed RMD to the return you are filing.
3. File a form 5329 requesting a waiver. 
4. The IRS grants waivers when you have a good reason.

The IRS RMD Rules state: 

Consequence for failing to take required minimum distributions

If you do not take any distributions, or if the distributions are not large enough, you may have to pay a 25% excise tax on the amount not distributed as required.

• To report the excise tax, you may have to file Form 5329, Additional Taxes on Qualified Plans (Including IRAs) and Other Tax-Favored Accounts.
• See the Form 5329 instructions PDF for additional information about this tax.