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My dictionary lists both いっさくねん and おととし as readings of 一昨年. Which of these are commonly used? Is there any difference between these two readings?

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おととし is far more common in everyday conversations with your friends and colleagues, whereas いっさくねん is used mainly in formal speeches and presentations. いっさくねん is the on-yomi of this word, so it's not surprising that いっさくねん sounds more formal and/or technical than おととし.

However, when people write おととし, they tend to use hiragana (it depends on the writer's taste). This is partly because おととし is a non-straightforward 熟字訓.

7.「一昨日」「明後日」「一昨年」は、「おととい」「あさって」「おととし」というように、ふつうひらがなで書きます。(from 東京外国語大学言語モジュール)

So when you see 一昨年 actually written on paper, and have to read it out loud, いっさくねん may be a better choice.

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