With the Liechtenstein Lotto you can play up to 50 weeks in advance. I do it myself and I can recommend it. There is no risk of forgetting to hand in your lines when you only need to do it once a year. Every week of the year you will have at least one line in the Lotto.
You can play one or several lotto lines for up to 50 weeks in advance. You can choose the number of weeks between 1 and 50. So, you can time your games with the tax return or a certain time of the year. If you need the money for something else, you can always choose to play a smaller number of weeks, until the next time you have some money to spare.