With 2013 bearing down on us, we hope you have a moment to spare from holiday preparation for some good old-fashioned year-end tax planning. By now you must be familiar with the term “fiscal cliff” and how the expiring provisions, tax rates, and budget appropriations may affect small business, big business, and politics in Washington, DC. However, the looming expiration dates for the Bush-era tax cuts and other tax provisions set to become effective in 2013 may also have consequences for how you save for retirement. This year we have advice for IRA account holders in particular:

Avoiding increased tax. If you have a traditional individual retirement account (IRA) and you are thinking about converting to a Roth so you can accumulate tax-free earnings, you might want to do it before the year ends. First, if you are in a high-income tax bracket, your taxes are likely to increase if the Bush-tax cuts expire. Converting from a traditional IRA to a Roth IRA creates a taxable event, and you may lose more money to the government by converting in 2013 than you would if you convert before 2012 ends.

Secondly, taxpayers whose projected 2013 adjusted gross income (AGI) will approach $250,000 (or $200,000 for single filers) may want to avoid converting their traditional IRA in 2013. The addition of their IRA assets to their AGI may push them within the income range limits for taxpayers subject to the 3.8 percent tax on net investment income that goes into effect in 2013.

Please note that the converted IRA assets would not themselves be subject to the 3.8 percent surtax. However the surtax would apply to any investment income the taxpayer has. Such investment income would include items such as (but not limited to) dividends, rents, royalties, interest, except municipal-bond interest, capital gains, and income from the sale of a principal residence worth more than the $250,000/$500,000 exclusions.

Undoing a conversion. You might be asking what would happen if you convert to a Roth IRA in 2012 and then Congress extends the current tax rates. In such cases, you would have until October 15, 2013 to undo the transaction. You could put the money back into your traditional IRA as if you had never converted in the first place. In other words, there would be no taxable event.

2010 conversion and deferral. Taxpayers who already converted their traditional IRA to a Roth IRA in 2010 were given a one-time privilege of deferring half of the income from the conversion to 2011 and the other half until 2012. If taxpayers elected to defer their IRA conversion income in this way, the 2012 tax year has arrived. They must report that second half of their conversion income on their 2012 tax returns. If you are a taxpayer who must report income from a previous Roth IRA conversion in 2012, it might not be in your best interest to generate additional income by converting yet another IRA before the year ends.

Contributions. The 2012 year-end will also bring several changes to the rules on IRA contributions, which may affect your planning. In 2013, the limits on maximum annual contributions to an IRA will go up from $5,000 to $5,500 ($6,500 for contributors age of 50 and over, up from $6,000 in 2012). This increase in contribution limits is the first time the IRS has adjusted the limit since 2008.

The adjusted gross income level at which taxpayers must begin to phase-out their contributions will also go up in 2013:

However, tax planners should note that the deadline for making IRA contributions for the 2012 tax year remains unchanged. You still have until your filing date, which is April 15, 2013, to make contributions for 2012.