The HMRC API can be used with the following years. Note if a submission has already been made, this will not return any data
2022/23
2021/22
2020/21
2019/20
2018/19
2017/18
The following years are available but may NOT return relevant data as HMRC are currently conducting automatic reconciliation (this takes place between May and September following the tax year end, but can take longer for some tax payers and therefore data may not be complete for them):
2023/24
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