I do not believe tithing can be given anonymously. Each donation must be associated with your member record number.
From the General Handbook on lds.org:
33. Records and Reports
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Accurate records help Church leaders know members and identify their needs. For example, records can help leaders identify who may need special care to become more active in the Church or to become worthy of temple blessings. Accurate records also help leaders evaluate progress and make plans for improvement.
Financial records include information about tithes and other offerings and costs for activities and supplies."
34. Finances and Audits
"Church funds are sacred and must be carefully accounted for and protected. These funds may be used only by authorized members for authorized Church purposes. Church leaders must protect against the embezzlement and any other misuse of Church funds. These funds may not be used for personal purposes or “borrowed.” Nor may Church funds be mixed with personal funds or deposited into the account of an individual. These and other misuses of Church funds are serious offenses that may result in Church membership restrictions or withdrawal.
The bishop assigns the ward clerk or an assistant ward clerk to help with ward financial record keeping. These duties are outlined in this section and explained further in instructions from Church headquarters or the assigned area office.
- Each week this clerk helps a member of the bishopric account for all tithes and other offerings (see 34.6.2). He normally accompanies the bishopric member who deposits the funds in a bank, although another Melchizedek Priesthood holder may do so. He also submits or transmits the related donation reports to Church headquarters or the assigned area office. Only members of the bishopric—not clerks—may receive funds for the ward.
- This clerk makes sure ward financial obligations are paid promptly. He prepares checks or, in locations where checks are not used, payment approval forms.
- He helps the bishopric prepare the annual ward budget and keep track of the ward budget allowance (see 34.7.1 and 34.7.2). He informs the bishop of the status of ward expenditures in relation to the budget allowance.
- He reconciles the ward checking account each month as instructed in 34.6.7.
- Each year he prepares and organizes records to help the bishop conduct tithing settlement. He produces and distributes the year-to-date tithing and offerings statements and year-end summaries to members. He also helps the bishop prepare a year-end report of tithing status in the ward.
- He participates in financial audits by stake auditors and takes corrective actions if needed (see 34.9).
Contributions
Church leaders should teach members the principles of tithes and other offerings and encourage members to live these principles. Nonmembers may also make contributions to the Church. However, a person who has had their membership withdrawn may not pay tithing or other offerings to the Church.
When and How to Pay Tithing
Leaders encourage members to pay tithing as they receive their income. However, members who wish to pay annually may do so.
Members give their tithing
and a completed Tithing and Other Offerings form to the bishop or one of his counselors.
Tithing Settlement
The bishop holds tithing settlement near the end of each year. In urgent cases when the bishop is absent, the stake president may authorize one of the bishop’s counselors to conduct tithing settlement. However, such a need would be rare.
All members should attend tithing settlement to
make sure their contribution records are correct and to declare to the bishop their status as tithe payers. If possible, all members of a family should attend tithing settlement.
In addition to reviewing records of members’ tithing, fast offerings, and other donations, during tithing settlement the bishop can discuss the principle of tithing with them, encourage them to give a generous fast offering, and discuss other relevant matters. At the time of tithing settlement, a clerk or a member of the bishopric could also review the Individual Ordinance Summary with members (see
33.6).
Instructions for tithing settlement are provided by Church headquarters or the assigned area office.
Receiving Tithing and Other Offerings
The Lord has given bishops the sacred trust of receiving and accounting for the tithes and other offerings of the Saints (see
Doctrine and Covenants 42:30–33;
119). Only the bishop and his counselors may receive tithes and other offerings. Under no circumstances should their wives, other members of their families, clerks, or other ward members receive these contributions. The only exception is when Aaronic Priesthood holders are assigned to collect fast offerings (see
34.4.2).
Ward members give contributions to a member of the bishopric in a sealed envelope with
a properly completed Tithing and Other Offerings form enclosed. Church members should not leave their donations unattended, such as by placing them in a contribution box or under the door of the bishop’s office.
Checks should be made payable to the ward, not to the bishop or the Church. In units where members make payments electronically (such as direct deposit or automatic bill pay), payments should be deposited in the Church’s bank account as instructed by Church headquarters or the assigned area office.
Only the stake president and his counselors should receive funds for the stake. They should maintain custody of the funds until the funds are recorded and prepared for deposit by a member of the stake presidency and a clerk. "