Nurses who stepped up to cover busy winter shifts were left "confused and distressed" following a pay dispute.
The Queen Elizabeth Hospital in Gateshead returned to weekly payments for nurses who do extra shifts on top of their ordinary hours.
It came after confusing tax rules meant some cash wasn't deducted from their pay after tax - and in other weeks the taxman took much more than they'd been expecting.
Hospital bosses say no members of staff got less cash overall than they were owed, but they acknowledged "confusion or distress" may have been caused when some weeks' pay was lighter than others.
The confusion hit nurses who work regular contacted shifts for the hospital, and had agreed to do extra 'bank' shifts over the winter.
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Some nurses contacted union representatives at Union Northen, after their payslips didn't show what they were expecting.
Unison regional organiser Peter Chapman said: "These were people who had volunteered to do extra shifts from the 'bank' to help cover shifts over the winter.
"I think paying weekly was genuinely meant to be an incentive for people - it was a mistake, but it was one that should have been foreseen.
"We've worked with the trust and we're satisfied they are now resolving the problem."
Hilary Lloyd, director of nursing and midwifery, said: "This issue affects a small number of nursing staff but we understand this has been confusing and we’ve been doing everything we can to try and explain the issues they may have experienced.
"We previously introduced weekly pay to try and make it faster and more convenient for nurses working extra shifts to get their pay, but unfortunately changes to tax rules made this much more difficult.
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"To ensure the right amount of tax is being deducted it meant that in practice people were getting overpaid some weeks but not having the tax deducted until a later time.
"While nobody has been financially disadvantaged by this, it can make it more difficult for people to budget or understand how much they are getting paid week to week.
"We’ve been communicating with our own staff as well as nurses from other organisations who work here on a temporary basis to try and resolve any problems and this has included making interim payments for those who may have particular financial issues.
"Because of the complexity and confusion, and after listening to staff, we have now decided to stop weekly payments and return to monthly ones that many staff are familiar with.
"We apologise for any confusion or distress this may have caused."
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