Gyroscopic Investing

Newbie question on I-Bonds-

It is pretty well known here that there is a limit on how many ($ worth of) I-Bonds you can buy each year.
But, what is the actual dividing line? Is it the calendar year, or can you also not buy the max amount in bonds within the same 12 months?

Another way to ask: I removed the hardlock from my Treasury Direct account in late 2013 and bough $10K worth of I-Bonds. Let's say it was December. Now it's 2014. If I have another $10K, can I go ahead and buy I-Bonds in March and yet again in early 2015? Or do I have to wait until December 2014?

Maybe I'm influenced by the rigid rules of IRA contributions, but I don't think they apply at all here.

Congrats on conquering Treasury Direct, Dualstow!!!!

Not 100% sure but I think it's calendar year.

I've never tried to buy more than the limit online, but I've wondered what would happen if I did.  I assume that you'd get an error message blocking the transaction.

I am fairly certain the limits apply to calendar year purchases.

Remember, you can buy $10k, your spouse/so can buy another $10k, and if you have a trust the trust can buy $10k.  Plus you can get $5k paper as part of your federal tax refund.  Per year.

Thank you both.