Drill-hall instruction, weekend exercises and all other training associated with the TA are set to stop temporarily, cutting costs by about £20m.
The move is likely to raise fears that operations in Afghanistan will be hit, as hundreds of "weekend warriors" serve in the troubled country.
However, the Ministry of Defence insisted there would be no impact, because TA soldiers train with their regular army counterparts before deployment to Helmand province.
The size of the TA has fallen rapidly since Labour came to power, from more than 57,000 to a trained strength of around 19,000.
An MoD spokesman said: "These are challenging times and like all Government departments, we have to live within our means.
"We routinely review our spending to balance priorities, focusing on the highest priorities including on our operations, particularly in Afghanistan."
Territorial Army soldiers have made a significant contribution to operations in Iraq and Afghanistan.
News of possible training cuts has raised fears about the knock-on effect to recruitment, morale and the ability of the TA to bolster regular troops serving abroad.
A six-month halt to training will also mean soldiers will not get paid.
A Ministry of Defence official said: “Those in the TA get paid for the training that they do. If they don’t do any training they won’t be paid.”
TA troops come together on one evening a week as well as on some weekends and during a two-week annual camp.
The base pay is the same as the regular army, underlining the shared dangers and commitment.
New entrants receive £33.73 a day as well as money for their travel, meals, and uniform.
The pay rises with rank, with privates receiving £42.07 a day, corporals getting £65.28 and sergeants on £74.20.
Among the officers, lieutenants receive £73.15 a day, captains get £93.74 and majors are on £118.08.
A Brigadier can receive as much as £254.04 a day.
Soldiers who complete their minimum training commitment also receive an annual tax-free bonus, ranging from £139 to more than £1,500.
In the UK the TA soldiers - everyone from lorry drivers to doormen, students, accountants and barristers - train at barracks based all over the country.
Many say their aim is to serve in war zones overseas although some are enjoying a break from regular civilian life.
Those who do volunteer to serve a six month tour of duty must also undergo a number of months in pre-deployment training.
Once deployed, TA soldiers fight alongside regulars, filling roles ranging from combat to medical and logistics.
About 6900 TA soldiers took part in the invasion of Iraq, and 1200 TA soldiers deploy on tours of duty each year, to Afghanistan, Iraq and the Balkans.
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