100S Tax Form (2018)

Use a 100s Tax Form 2018 template to make your document workflow more streamlined.

What the 100S Tax Form (2018) is

The 100S Tax Form (2018) is a California S corporation franchise or income tax return used to report an S corporation’s tax information to the California Franchise Tax Board. It captures the corporation’s identifying details, income, deductions, credits, tax computation, payments, and authorized signatures for the 2018 tax year. A preparer can upload the form to signNow, review detected fields, route the completed return to authorized officers, and preserve the signed PDF with its audit trail. Electronic signing supports record completion; it does not replace any required California filing, payment, or agency submission step.

Who benefits from a structured 100S workflow

The 2018 100S return is most useful when California S corporations, tax firms, and finance teams need controlled preparation and documented approval.

California S corporations use the 2018 100S return to organize corporation-level tax information, secure officer approval, and retain a signed copy before completing the required state filing process.
Tax preparation firms use reusable 100S templates to collect client information, route completed returns to authorized signers, and preserve an audit trail alongside engagement records.
Finance departments at multi-entity businesses use controlled signing workflows to separate preparer access from officer approval while maintaining consistent copies of each entity’s 2018 return.

How the 100S return moves from draft to record

The 2018 100S workflow moves from form preparation through authorized review, electronic signing, and auditable recordkeeping.

Upload the return: Upload the 2018 California return and let signNow identify fillable fields.
Complete required fields: Review corporation details, income figures, deductions, credits, and signature fields.
Route for signatures: Send the prepared return to authorized officers for review and signature.
Store signed records: Download the completed copy and preserve its audit trail with business records.

Steps to complete the 2018 100S form

Prepare the California return in signNow, verify every field, obtain authorized signatures, and preserve the completed record.

Upload the form:
Upload the 2018 100S Tax Form PDF.
Check the fields:
Review detected fields and add missing entries.
Assign signers:
Assign signature fields to authorized officers.
Send for signing:
Send the return for review and signatures.
Save the record:
Download the signed return and audit trail.

Connect the 100S workflow to business systems

Connect the 100S Tax Form workflow with CRM, ERP, storage, and project systems to reduce rekeying and preserve signed business records.

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Challenges when preparing the 2018 100S return

Entering corporation identification or tax figures inconsistently can delay review and require corrections before filing.
Using an unsigned or incomplete 2018 return can weaken the organization’s internal evidence of approval.
Sending sensitive tax information without controlled access can expose taxpayer identification and financial details.
Confusing electronic signature completion with California tax submission can leave a filing obligation unfinished.

Protecting signed 100S tax records

TLS 1.2 and 1.3:

Encrypted transit

AES-256 at rest:

Encrypted storage

SOC 2 Type II certified:

Independent assurance

ISO 27001 certified:

Security certification

ESIGN and UETA:

Tax record framework

Two-factor authentication:

Access protection

Find and fill out the correct 100s tax 2017 form

airSlate SignNow helps you fill in and sign documents in minutes, error-free. Choose the correct version of the editable PDF form from the list and get started filling it out.

Versions	Form popularity	Fillable & printable
2016 CA FTB 100S Tax Booklet 2018	4.8 Satisfied (2002 Votes)
2016 CA FTB 100S Tax Booklet 2016	4.6 Satisfied (1290 Votes)

Authenticate signer:

The audit trail records the signer’s authentication event before signature completion.

Capture timestamps:

Each review and signature action receives a recorded date and time.

Record document integrity:

The completed 100S document is associated with integrity evidence after signing.

Seal the record:

The signed record is sealed against unnoticed post-signature changes.

Link signing events:

The audit history connects signer actions with the final 100S copy.

Export audit evidence:

Authorized users can retrieve or export the completed audit trail.

Recordkeeping practices for the 2018 100S return

Retain the signed 100S return, supporting workpapers, filing evidence, and audit trail according to the corporation’s tax policy and applicable IRS and California requirements.

Set a documented retention policy

Keep the signed 100S return with the corporation’s tax workpapers and filing evidence. Federal IRS guidance generally uses three years from filing under IRC §6501(a), but California requirements and audit circumstances may require longer retention.

Export the audit trail

Export the completed signNow audit trail with the signed 100S return. Preserve signer identity, timestamps, and action history so the organization can demonstrate how authorized officers approved the 2018 document.

Limit access to tax data

Restrict access to taxpayer identification and financial information through role-based permissions. Limit preparation, review, and sending privileges to personnel assigned to the corporation’s California tax workflow.

Reconcile figures before signing

Verify every populated field against the corporation’s 2018 tax workpapers before signature. Electronic signing confirms approval of the displayed document; it does not correct inaccurate income, deduction, or credit information.

Prepare the document

Upload the 2018 California return, then inspect detected fields and correct placement manually.

Deliver to signers

Send the completed draft to authorized corporate officers through signNow’s email workflow.

Complete signer review

Signers review the corporation’s information and complete assigned signature fields.

Archive the record

Download the signed return and audit trail after every required signature is recorded.

Legal standing of an electronically signed 100S return

An electronic signature on a business tax record can be admissible when intent, consent, signer attribution, and reliable record retention are demonstrated under ESIGN, 15 U.S.C. chapter 96, and applicable UETA rules. The 100S remains subject to California filing requirements; wills, court orders, and other statutory exclusions are outside this workflow.

Why teams look for DocuSign alternatives

Mobile options for the 2018 100S return

The 2018 100S Tax Form can be prepared from a signNow browser workflow or mobile app, subject to the source document’s quality and the organization’s review controls. signNow provides iOS and Android apps, while camera capture can create a document image for later field placement and signing.

iOS signNow iOS app
Android signNow Android app
Camera capture Camera capture for PDF

Mobile signing is useful for authorized officers reviewing a prepared California return away from the office. Use managed devices, confirm the final PDF before signing, and preserve the audit trail with the corporation’s tax records. Electronic completion does not replace any required California filing or payment process.

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Troubleshooting the 2018 100S workflow

These answers separate signNow workflow issues from California tax preparation and filing obligations for the 2018 100S return.

Upload the 2018 California return as a clear PDF, then inspect signNow’s detected fields. Auto-detection does not verify tax calculations or California Franchise Tax Board requirements, so compare every populated value with the corporation’s workpapers before sending.

Business includes legally binding eSignatures, templates, audit trails, mobile apps, ISO 27001, SOC 2, and GDPR controls. The plan’s 100 signature invites per user per year and overage terms should be checked before routing repeated 100S returns.

Use Business Premium when repeated 100S returns require bulk send. The product ground truth identifies bulk send as a Business Premium feature, while Business provides templates and audit trails without that stated bulk-send capability.

ESIGN and UETA can support electronic signatures when intent, consent, attribution, and record retention are established. They do not authorize signNow to file the 100S with California, so complete any required Franchise Tax Board submission separately.

For consumer-facing electronic records, ESIGN requires disclosure of paper-record rights, electronic access, and withdrawal procedures under 15 U.S.C. §7001(c). Apply that requirement when the 100S workflow involves a consumer-facing transaction rather than only internal business approval.

Use role-based access and two-factor authentication for taxpayer identification and financial data. signNow states that data is encrypted in transit with TLS 1.2/1.3 and at rest with AES-256; preserve the audit trail with the signed return.

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