If you’re self-employed, don’t forget this important tax-payment deadline coming up fast in June. ... For example, if your tax bill last year was $30,000, this year you would pay $33,000 ...

Assume you're a self-employed consultant and you generated $30,000 this year in consulting income. You can create a solo 401(k) and contribute the $16,500 (or $22,000 if 50 or over) this year.

The federal self-employment tax is 15.3%, ... ($15,000 for single filers and $30,000 for joint filers), you might not be required to file a federal tax return. ...