BOSTON (AP) — The overwhelming majority of Massachusetts taxpayers are filing their state tax returns electronically.

The Department of Revenue reported that as of Friday it processed just under 2.5 million returns, of which nearly 2.2 million had been e-filed.

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The agency reported issuing about 1.8 million refunds totaling $858 million. The average turnaround time for a refund was 3.3 days for returns filed electronically, and 5-1/2 days for paper returns.

The deadline for filing state and federal taxes is Tuesday.

The department said it was fielding about 34,000 calls a week with tax questions and the average wait time for callers was 46 seconds.